In computing, an interface is a shared boundary across which two or more separate components of a computer system exchange information. The exchange can be between software , computer hardware , peripheral devices , humans , and combinations of these. Some computer hardware devices, such as a touchscreen , can both send and receive data through the interface, while others such as a mouse or microphone may only provide an interface to send data to a given system.
105-436: Thunderbolt is the brand name of a hardware interface for the connection of external peripherals to a computer . It was developed by Intel in collaboration with Apple . It was initially marketed under the name Light Peak , and first sold as part of an end-user product on 24 February 2011. Thunderbolt combines PCI Express (PCIe) and DisplayPort (DP) into two serial signals, and additionally provides DC power via
210-444: A dummy implementation may be used to allow development to progress before the final implementation is available. In another case, a fake or mock implementation may be substituted during testing. Such stub implementations are replaced by real code later in the development process. Usually, a method defined in an interface contains no code and thus cannot itself be called; it must be implemented by non-abstract code to be run when it
315-432: A $ 100 reward. Difficulty in finding enough dating videos led to a change of plans, with the site's founders deciding to accept uploads of any video. YouTube began as a venture capital –funded technology startup . Between November 2005 and April 2006, the company raised money from various investors, with Sequoia Capital and Artis Capital Management being the largest two. YouTube's early headquarters were situated above
420-753: A British think tank, found that harassment against women was flourishing on YouTube. In his 2022 book Like, Comment, Subscribe: Inside YouTube's Chaotic Rise to World Domination , Bloomberg reporter Mark Bergen said that many female content creators were dealing with harassment, bullying, and stalking. YouTube has been criticized for using an algorithm that gives great prominence to videos that promote conspiracy theories, falsehoods and incendiary fringe discourse. According to an investigation by The Wall Street Journal , "YouTube's recommendations often lead users to channels that feature conspiracy theories, partisan viewpoints and misleading videos, even when those users haven't shown interest in such content. When users show
525-451: A Thunderbolt 3 or later port. DisplayPort and Mini DisplayPort devices are supported. Some functionality may be available if a Thunderbolt device is connected to a USB-C port; this is implementation-dependent, and not guaranteed. Thunderbolt 4 supports Thunderbolt 3 devices, but not earlier versions. Thunderbolt 1 and 2 devices can be used with most, but not all, Thunderbolt 3 PCs with the use of an adapter. CNET 's Brooke Crothers said it
630-405: A claim by The Daily Dot that the views had been deleted due to a violation of the site's terms of service, which ban the use of automated processes to inflate view counts. This was disputed by Billboard , which said that the two billion views had been moved to Vevo, since the videos were no longer active on YouTube. On August 5, 2015, YouTube patched the formerly notorious behavior which caused
735-507: A combination port, and that USB was not open to modification in that way. Other implementations of the technology began in 2012, with desktop boards offering the interconnection now available. Apple stated in February 2011 that the port was based on Mini DisplayPort , not USB. As the system was described, Intel's solution to the display connection problem became clear: Thunderbolt controllers multiplex data from existing DP systems with data from
840-431: A database. When a video is uploaded, it is checked against the database, and flags the video as a copyright violation if a match is found. When this occurs, the content owner has the choice of blocking the video to make it unviewable, tracking the viewing statistics of the video, or adding advertisements to the video. An independent test in 2009 uploaded multiple versions of the same song to YouTube and concluded that while
945-547: A dinner party at Chen's apartment in San Francisco . Karim did not attend the party and denied that it had occurred, but Chen remarked that the idea that YouTube was founded after a dinner party "was probably very strengthened by marketing ideas around creating a story that was very digestible". Karim said the inspiration for YouTube came from the Super Bowl XXXVIII halftime show controversy , when Janet Jackson 's breast
1050-421: A discrete monitor. Thunderbolt 2 incorporates DisplayPort 1.2 support, which allows for video streaming to a single 4K video monitor or dual QHD monitors. Thunderbolt 2 is backwards compatible, which means that all Thunderbolt cables and connectors are compatible with Thunderbolt 1. The first Thunderbolt 2 product for the consumer market was Asus 's Z87-Deluxe/Quad motherboard, announced on 19 August 2013, and
1155-559: A laptop with a Light Peak connector, indicating that the technology had shrunk enough to fit inside such a device, and had the laptop send two simultaneous HD video streams down the connection, indicating that at least some fraction of the software/firmware stacks and protocols were functional. At the same demonstration, Intel officials said they expected hardware manufacturing to begin around the end of 2010. In September 2010, some early commercial prototypes from manufacturers were demonstrated at Intel Developer Forum 2010. Though Thunderbolt
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#17328694649621260-570: A lawsuit against YouTube in November 2006, after being regularly overloaded by people looking for YouTube. Universal Tube subsequently changed its website to www.utubeonline.com . On October 9, 2006, Google announced that they had acquired YouTube for $ 1.65 billion in Google stock. The deal was finalized on November 13, 2006. Google's acquisition launched newfound interest in video-sharing sites; IAC , which now owned Vimeo, focused on supporting
1365-846: A major lawsuit by Viacom International in 2011 that nearly resulted in the discontinuation of the website. The lawsuit was filed as a result of alleged copyright infringement of Viacom's material by YouTube. However, the United States Court of Appeals for the Second Circuit ruled that YouTube was not liable, and thus YouTube won the case in 2012. Susan Wojcicki was appointed CEO of YouTube in February 2014. In January 2016, YouTube expanded its headquarters in San Bruno by purchasing an office park for $ 215 million. The complex has 51,468 square metres (554,000 square feet) of space and can house up to 2,800 employees. YouTube officially launched
1470-525: A media watchdog group, reported that homophobic and transphobic content calling LGBT people "predators" and "groomers" was becoming more common on YouTube. The report also referred to common accusations in YouTube videos that LGBT people are mentally ill . The report stated the content appeared to be in violation of YouTube's hate speech policy. An August 2022 report by the Center for Countering Digital Hate ,
1575-457: A new line of iMacs that include the Thunderbolt interface. The Thunderbolt port on the new Macs is in the same location relative to other ports and maintains the same physical dimensions and pinout as the prior MDP connector. The main visible difference on Thunderbolt-equipped Macs is a Thunderbolt symbol next to the port. The DisplayPort standard is partially compatible with Thunderbolt, as
1680-549: A new office in San Bruno, California . Hurley announced that he would be stepping down as chief executive officer of YouTube to take an advisory role and that Salar Kamangar would take over as head of the company in October 2010. In December 2009, YouTube partnered with Vevo . In April 2010, Lady Gaga's " Bad Romance " became the most viewed video , becoming the first video to reach 200 million views on May 9, 2010. YouTube faced
1785-469: A paid subscription option for watching content without ads. YouTube incorporated Google's AdSense program, generating more revenue for both YouTube and approved content creators. In 2023, YouTube's advertising revenue totaled $ 31.7 billion, a 2% increase from the $ 31.1 billion reported in 2022. From Q4 2023 to Q3 2024, YouTube's combined revenue from advertising and subscriptions exceeded $ 50 billion. Since its purchase by Google, YouTube has expanded beyond
1890-509: A pizzeria and a Japanese restaurant in San Mateo, California . In February 2005, the company activated www.youtube.com . The first video was uploaded on April 23, 2005. Titled " Me at the zoo ", it shows co-founder Jawed Karim at the San Diego Zoo and can still be viewed on the site. The same day, the company launched a public beta and by November, a Nike ad featuring Ronaldinho became
1995-425: A political bias in what they choose to view, YouTube typically recommends videos that echo those biases, often with more-extreme viewpoints." After YouTube drew controversy for giving top billing to videos promoting falsehoods and conspiracy when people made breaking-news queries during the 2017 Las Vegas shooting , YouTube changed its algorithm to give greater prominence to mainstream media sources. In 2017, it
2100-401: A programming style called programming to the interface . The idea behind this approach is to base programming logic on the interfaces of the objects used, rather than on internal implementation details. Programming to the interface reduces dependency on implementation specifics and makes code more reusable. Pushing this idea to the extreme, inversion of control leaves the context to inject
2205-472: A set of community guidelines aimed to reduce abuse of the site's features. The uploading of videos containing defamation, pornography, and material encouraging criminal conduct is forbidden by YouTube's "Community Guidelines". Generally prohibited material includes sexually explicit content, videos of animal abuse, shock videos , content uploaded without the copyright holder's consent, hate speech, spam, and predatory behavior. YouTube relies on its users to flag
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#17328694649622310-496: A short-form video platform. During this period, YouTube entered disputes with other tech companies. For over a year, in 2018 and 2019, no YouTube app was available for Amazon Fire products. In 2020, Roku removed the YouTube TV app from its streaming store after the two companies were unable to reach an agreement. After testing earlier in 2021, YouTube removed public display of dislike counts on videos in November 2021, claiming
2415-539: A single cable. Up to six peripherals may be supported by one connector through various topologies . Thunderbolt 1 and 2 use the same connector as Mini DisplayPort (MDP), whereas Thunderbolt 3, 4, and 5 use the USB-C connector, and support USB devices. Thunderbolt controllers multiplex one or more individual data lanes from connected PCIe and DisplayPort devices for transmission via two duplex Thunderbolt lanes, then de-multiplex them for use by PCIe and DisplayPort devices on
2520-509: A skit " Lazy Sunday " by The Lonely Island . Besides helping to bolster ratings and long-term viewership for Saturday Night Live , "Lazy Sunday"'s status as an early viral video helped establish YouTube as an important website. Unofficial uploads of the skit to YouTube drew in more than five million collective views by February 2006 before they were removed when NBCUniversal requested it two months later based on copyright concerns. Despite eventually being taken down, these duplicate uploads of
2625-434: A software module A is deliberately defined separately from the implementation of that module. The latter contains the actual code of the procedures and methods described in the interface, as well as other "private" variables, procedures, etc. Another software module B , for example the client to A , that interacts with A is forced to do so only through the published interface. One practical advantage of this arrangement
2730-465: A system for automatic detection of uploaded videos that infringe copyright. Google CEO Eric Schmidt regarded this system as necessary for resolving lawsuits such as the one from Viacom , which alleged that YouTube profited from content that it did not have the right to distribute. The system, which was initially called "Video Identification" and later became known as Content ID, creates an ID File for copyrighted audio and video material, and stores it in
2835-591: A third app oriented towards streaming and discovering the music content hosted on the YouTube platform. The company also attempted to create products appealing to specific viewers. YouTube released a mobile app known as YouTube Kids in 2015, designed to provide an experience optimized for children. It features a simplified user interface, curated selections of channels featuring age-appropriate content, and parental control features. Also in 2015, YouTube launched YouTube Gaming—a video gaming -oriented vertical and app for videos and live streaming, intended to compete with
2940-599: A video's view count to freeze at "301" (later "301+") until the actual count was verified to prevent view count fraud . YouTube view counts once again updated in real time. Since September 2019, subscriber counts are abbreviated. Only three leading digits of channels' subscriber counts are indicated publicly, compromising the function of third-party real-time indicators such as that of Social Blade . Exact counts remain available to channel operators inside YouTube Studio. On November 11, 2021, after testing out this change in March of
3045-535: A view and just over 85% of them have fewer than 1,000 views. YouTube has faced numerous challenges and criticisms in its attempts to deal with copyright, including the site's first viral video, Lazy Sunday , which had to be taken down, due to copyright concerns. At the time of uploading a video, YouTube users are shown a message asking them not to violate copyright laws. Despite this advice, many unauthorized clips of copyrighted material remain on YouTube. YouTube does not view videos before they are posted online, and it
3150-412: A year and a half later, on August 9, 2024. In late October 2023, YouTube began cracking down on the use of ad blockers on the platform. Users of ad blockers may be given a pop-up warning saying "Video player will be blocked after 3 videos". Users of ad blockers are shown a message asking them to allow ads or inviting them to subscribe to the ad-free YouTube Premium subscription plan. YouTube says that
3255-599: Is embedded into the cable itself, so the current MDP connector is forward compatible. Eventually, Intel hopes for a purely optical transceiver assembly embedded in the PC. The first such optical Thunderbolt cable was introduced by Sumitomo Electric Industries in January 2013. It is available in lengths of 10 m (30 ft), 20 m (70 ft), and 30 m (100 ft). However, those cables are retailed almost exclusively in Japan, and
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3360-460: Is invoked. An interface called " Stack " might define two methods: push() and pop() . It can be implemented in different ways, for example, FastStack and GenericStack —the first being fast, working with a data structure of fixed size, and the second using a data structure that can be resized, but at the cost of somewhat lower speed. Though interfaces can contain many methods, they may contain only one or even none at all. For example,
3465-565: Is left to copyright holders to issue a DMCA takedown notice pursuant to the terms of the Online Copyright Infringement Liability Limitation Act . Any successful complaint about copyright infringement results in a YouTube copyright strike . Three successful complaints for copyright infringement against a user account will result in the account and all of its uploaded videos being deleted. From 2007 to 2009 organizations including Viacom , Mediaset , and
3570-411: Is that replacing the implementation of A with another implementation of the same interface should not cause B to fail—how A internally meets the requirements of the interface is not relevant to B , which is only concerned with the specifications of the interface. (See also Liskov substitution principle .) In some object-oriented languages, especially those without full multiple inheritance ,
3675-541: Is the ability to carry power. The final Thunderbolt standard specifies 10 W DC on every port. See comparison section below. Intel and industry partners are still developing optical Thunderbolt hardware and cables. The optical fiber cables would run "tens of meters" but would not supply power, at least not initially. The version from Corning contains four 80/125 μm VSDN (Very Short Distance Network) fibers to transport an infrared signal up to 190 m (600 ft). The conversion of electrical signal to optical
3780-408: Is the length of active cables available from most brands, including CalDigit, Cable Matters, et al., while Apple are currently the only company that offers a 3 m (9.8 ft) active copper cable. Optical Thunderbolt 4 cables were targeting lengths from ~5 m (16 ft) to 50 m (160 ft), although this may not happen, instead jumping to Thunderbolt 5 optical cables, sometime after
3885-680: Is to prohibit access to all resources by default, allowing access only through well-defined entry points, i.e., interfaces. Software interfaces provide access to computer resources (such as memory, CPU, storage, etc.) of the underlying computer system; direct access (i.e., not through well-designed interfaces) to such resources by software can have major ramifications—sometimes disastrous ones—for functionality and stability. Interfaces between software components can provide constants , data types , types of procedures , exception specifications, and method signatures . Sometimes, public variables are also defined as part of an interface. The interface of
3990-495: The Amazon.com -owned Twitch . The company was attacked on April 3, 2018, when a shooting occurred at YouTube's headquarters in San Bruno, California, which wounded four and resulted in the death of the shooter. By February 2017, one billion hours of YouTube videos were being watched every day, and 400 hours worth of videos were uploaded every minute. Two years later, the uploads had risen to more than 500 hours per minute. During
4095-614: The COVID-19 pandemic , when most of the world was under stay-at-home orders , usage of services like YouTube significantly increased. One data firm estimated that YouTube was accounting for 15% of all internet traffic , twice its pre-pandemic level. In response to EU officials requesting that such services reduce bandwidth as to make sure medical entities had sufficient bandwidth to share information, YouTube and Netflix stated they would reduce streaming quality for at least thirty days as to cut bandwidth use of their services by 25% to comply with
4200-502: The Java language defines the interface Readable that has the single read () method; various implementations are used for different purposes, including BufferedReader , FileReader , InputStreamReader , PipedReader , and StringReader . Marker interfaces like Serializable contain no methods at all and serve to provide run-time information to generic processing using Reflection . The use of interfaces allows for
4305-510: The motherboard of computers with onboard video , such as the MacBook Air . The interface was originally intended to run exclusively on an optical physical layer using components and flexible optical fiber cabling developed by Intel partners and at Intel's Silicon Photonics lab. It was initially marketed under the name Light Peak, and after 2011 as Silicon Photonics Link. However, it was discovered that conventional copper wiring could furnish
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4410-465: The "polymer" redesign of its user interfaces based on Material Design language as its default, as well a redesigned logo that is built around the service's play button emblem in August 2017. Through this period, YouTube tried several new ways to generate revenue beyond advertisements. In 2013, YouTube launched a pilot program for content providers to offer premium, subscription-based channels. This effort
4515-512: The EU's request. YouTube later announced that they would continue with this move worldwide: "We continue to work closely with governments and network operators around the globe to do our part to minimize stress on the system during this unprecedented situation." Following a 2018 complaint alleging violations of the Children's Online Privacy Protection Act (COPPA), the company was fined $ 170 million by
4620-565: The English Premier League have filed lawsuits against YouTube, claiming that it has done too little to prevent the uploading of copyrighted material. In August 2008, a US court ruled in Lenz v. Universal Music Corp. that copyright holders cannot order the removal of an online file without first determining whether the posting reflected fair use of the material. YouTube's owner Google announced in November 2015 that they would help cover
4725-609: The FTC for collecting personal information from minors under the age of 13. YouTube was also ordered to create systems to increase children's privacy. Following criticisms of its implementation of those systems, YouTube started treating all videos designated as "made for kids" as liable under COPPA on January 6, 2020. Joining the YouTube Kids app, the company created a supervised mode, designed more for tweens , in 2021. Additionally, to compete with TikTok , YouTube released YouTube Shorts ,
4830-464: The MacBook Air use the one-port version. Support was added to Intel's Skylake architecture chipsets, shipping during late 2015 into early 2016. Interface (computing)#Hardware interfaces Hardware interfaces exist in many components, such as the various buses , storage devices , other I/O devices, etc. A hardware interface is described by the mechanical, electrical, and logical signals at
4935-535: The PCIe port into a single cable. Older displays that using DP 1.1a or earlier must be located at the end of a Thunderbolt device chain, but native displays can be anywhere along the line. Thunderbolt devices can go anywhere on the chain. In that respect, Thunderbolt shares a relationship with the older ACCESS.bus system, which used the display connector to support a low-speed bus. Apple states that up to six daisy-chained peripherals are supported per Thunderbolt port, and that
5040-497: The Thunderbolt port can provide a native DisplayPort signal with four lanes of output data at no more than 5.4 Gbit/s per Thunderbolt lane. When connected to a Thunderbolt device, the per-lane data rate becomes 10 Gbit/s and the four Thunderbolt lanes are configured as two duplex lanes, each 10 Gbit/s comprising one lane of input and one lane of output. Thunderbolt can be implemented on PCIe graphics cards , which have access to DisplayPort data and PCIe connectivity, or on
5145-482: The US in late September 2013. Intel introduced Light Peak at the 2009 Intel Developer Forum (IDF), using a prototype Mac Pro logic board to run two 1080p video streams plus LAN and storage devices over a single 30-meter optical cable with modified USB ends. The system was driven by a prototype PCI Express card, with two optical buses powering four ports. Jason Ziller, head of Intel's Optical I/O Program Office showed
5250-482: The Western marketplace, along with optical USB 3.0 cables, both under the brand name "Optical Cables". Half the diameter and a fifth the mass of comparable copper Thunderbolt cables, they work with the 10 Gbit/s Thunderbolt protocol and the 20 Gbit/s Thunderbolt 2 protocol, and thus are able to work with all self-powered Thunderbolt devices (unlike copper cables, optical cables cannot provide power). The cables extend
5355-520: The announcement, software developer Dmitry Selivanov created Return YouTube Dislike, an open-source , third-party browser extension for Chrome and Firefox that allows users to see a video's number of dislikes. In a letter published on January 25, 2022, by then YouTube CEO Susan Wojcicki , acknowledged that removing public dislike counts was a controversial decision, but reiterated that she stands by this decision, claiming that "it reduced dislike attacks." In 2022, YouTube launched an experiment where
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#17328694649625460-478: The arrival of that standard in late 2024. Details on compatibility are available from the Thunderbolt Technology Community Web site. A single Thunderbolt 3 or later port provides data transfer, support for two 4K 60 Hz displays, and quick notebook charging up to 100W with a single cable. Any Thunderbolt or USB dock can connect to a Thunderbolt 3 computer. USB devices can be connected to
5565-478: The code with the specific implementations of the interface that will be used to perform the work. A user interface is a point of interaction between a computer and humans; it includes any number of modalities of interaction (such as graphics, sound, position, movement, etc.) where data is transferred between the user and the computer system. YouTube YouTube is an American social media and online video sharing platform owned by Google . YouTube
5670-460: The company again changed its interface and at the same time, introduced a new logo with a darker shade of red. A subsequent interface change, designed to unify the experience across desktop, TV, and mobile, was rolled out in 2013. By that point, more than 100 hours were being uploaded every minute, increasing to 300 hours by November 2014. During this time, the company also went through some organizational changes. In October 2006, YouTube moved to
5775-400: The company simplified its interface to increase the time users would spend on the site. In 2011, more than three billion videos were being watched each day with 48 hours of new videos uploaded every minute. However, most of these views came from a relatively small number of videos; according to a software engineer at that time, 30% of videos accounted for 99% of views on the site. That year,
5880-544: The company was bought by eBay . Hurley had studied design at the Indiana University of Pennsylvania , and Chen and Karim studied computer science together at the University of Illinois Urbana-Champaign . According to a story that has often been repeated in the media, Hurley and Chen developed the idea for YouTube during the early months of 2005, after they had experienced difficulty sharing videos that had been shot at
5985-672: The company would show users who watched longer videos on TVs a long chain of short un-skippable adverts, intending to consolidate all ads into the beginning of a video. Following public outrage over the unprecedented amount of un-skippable ads, YouTube "ended" the experiment on September 19 of that year. In October, YouTube announced that they would be rolling out customizable user handles in addition to channel names, which would also become channel URLs. On February 16, 2023, Wojcicki announced that she would step down as CEO, with Neal Mohan named as her successor. Wojcicki took on an advisory role for Google and parent company Alphabet . Wojcicki died
6090-424: The content creators to distinguish itself from YouTube. It is at this time YouTube issued the slogan "Broadcast Yourself". The company experienced rapid growth. The Daily Telegraph wrote that in 2007, YouTube consumed as much bandwidth as the entire Internet in 2000. By 2010, the company had reached a market share of around 43% and more than 14 billion views of videos, according to comScore . That year,
6195-573: The content of videos as inappropriate, and a YouTube employee will view a flagged video to determine whether it violates the site's guidelines. Despite the guidelines,YouTube has faced criticism over aspects of its operations, its recommendation algorithms perpetuating videos that promote conspiracy theories and falsehoods, hosting videos ostensibly targeting children but containing violent or sexually suggestive content involving popular characters , videos of minors attracting pedophilic activities in their comment sections, and fluctuating policies on
6300-756: The core website into mobile apps , network television, and the ability to link with other platforms. Video categories on YouTube include music videos , video clips , news , short and feature films , songs , documentaries , movie trailers , teasers , TV spots , live streams , vlogs , and more. Most content is generated by individuals , including collaborations between " YouTubers " and corporate sponsors. Established media, news, and entertainment corporations have also created and expanded their visibility to YouTube channels in order to reach greater audiences. YouTube has had unprecedented social impact , influencing popular culture, internet trends, and creating multimillionaire celebrities. Despite its growth and success,
6405-441: The current 30 m (100 ft) maximum length offered by copper to a maximum of 60 m (200 ft). Before 2020, there were no optical Thunderbolt 3 cables on the market. However, optical Thunderbolt 1 and 2 cables could be used at the time with Apple 's Thunderbolt 3 (USB-C) to Thunderbolt 2 adapters on each end of the cable. This achieves connections up to the 60 m (200 ft) maximum offered by previous versions of
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#17328694649626510-507: The data simultaneously or serial where data are sent one bit at a time. A software interface may refer to a wide range of different types of interfaces at different "levels". For example, an operating system may interface with pieces of hardware. Applications or programs running on the operating system may need to interact via data streams , filters, and pipelines. In object oriented programs , objects within an application may need to interact via methods . A key principle of design
6615-861: The desired 10 Gbit/s per channel at lower cost. This copper-based version of the Light Peak concept was co-developed by Apple and Intel . Apple registered Thunderbolt as a trademark , but later transferred the mark to Intel, which held overriding intellectual-property rights. Thunderbolt was commercially introduced on Apple's 2011 MacBook Pro , using the same Apple-developed connector as Mini DisplayPort . Certain MacBook Air, MacBook Pro, Mac mini and iMac models downgrade Thunderbolt 4 protocol to Thunderbolt 3 due to not supporting dual 4K displays over Thunderbolt. Sumitomo Electric Industries started selling up to 30 m (100 ft) optical Thunderbolt cables in Japan in January 2013, and Corning, Inc. , began selling up to 60 m (200 ft) optical cables in
6720-700: The display should come at the end of the chain, if it does not support daisy chaining. In February 2011, Apple introduced MacBook Pro (13-inch, Early 2011) , Macbook Pro (15-inch, Early 2011) , and Macbook Pro ( 17-inch, Early 2011 ) featuring one Thunderbolt port. In May 2011, Apple introduced iMac (21.5-inch, Mid 2011) featuring one Thunderbolt port, and iMac (27-inch, Mid 2011) featuring two Thunderbolt ports. In July 2011, Apple introduced Mac mini (Mid 2011) , MacBook Air (11-inch, Mid 2011) , MacBook Air (13-inch, Mid 2011) and Apple Thunderbolt Display featuring one Thunderbolt port for daisy-chaining, or other devices. In May 2011, Apple announced
6825-519: The dispute was resolved. Since April 2016, videos continue to be monetized while the dispute is in progress, and the money goes to whoever won the dispute. Should the uploader want to monetize the video again, they may remove the disputed audio in the "Video Manager". YouTube has cited the effectiveness of Content ID as one of the reasons why the site's rules were modified in December 2010 to allow some users to upload videos of unlimited length. YouTube has
6930-483: The dispute with GEMA was resolved, with Google content ID being used to allow advertisements to be added to videos with content protected by GEMA. In April 2013, it was reported that Universal Music Group and YouTube have a contractual agreement that prevents content blocked on YouTube by a request from UMG from being restored, even if the uploader of the video files a DMCA counter-notice. As part of YouTube Music, Universal and YouTube signed an agreement in 2017, which
7035-490: The existing Google Play Music service. The service continued to evolve in 2015 when YouTube announced YouTube Red , a new premium service that would offer ad-free access to all content on the platform (succeeding the Music Key service released the previous year), premium original series, and films produced by YouTube personalities, as well as background playback of content on mobile devices. YouTube also released YouTube Music ,
7140-654: The first system released with Thunderbolt 2 was Apple's late 2013 Retina MacBook Pro, on 22 October 2013. Thunderbolt 3 is a hardware interface developed by Intel. It shares USB-C connectors with USB, supports USB 3.1 Gen 2 , and can require special "active" cables for maximum performance for cable lengths over 0.5 meters (1.5 feet). Compared to Thunderbolt 2, it doubles the bandwidth to 40 Gbit/s (5 GB/s). It allows up to 4 lanes of PCI Express 3.0 (32.4 Gbit/s) for general-purpose data transfer, and 4 lanes of DisplayPort 1.4 HBR3 (32.40 Gbit/s before 8/10 encoding removal, and 25.92 Gbit/s after) for video, but
7245-564: The first video to reach one million total views. The site launched officially on December 15, 2005, by which time the site was receiving 8 million views a day. Clips at the time were limited to 100 megabytes, as little as 30 seconds of footage. YouTube was not the first video-sharing site on the Internet; Vimeo was launched in November 2004, though that site remained a side project of its developers from CollegeHumor . The week of YouTube's launch, NBC-Universal's Saturday Night Live ran
7350-475: The interface and the protocol for sequencing them (sometimes called signaling). A standard interface, such as SCSI , decouples the design and introduction of computing hardware, such as I/O devices, from the design and introduction of other components of a computing system, thereby allowing users and manufacturers great flexibility in the implementation of computing systems. Hardware interfaces can be parallel with several electrical connections carrying parts of
7455-558: The internal components of the technology under a microscope and the sending of data through an oscilloscope. The technology was described as having an initial speed of 10 Gbit/s over plastic optical cables, and promising a final speed of 100 Gbit/s. At the show, Intel said Light Peak-equipped systems would begin to appear in 2010, and posted a YouTube video showing Light Peak-connected HD cameras, laptops, docking stations, and HD monitors. On 4 May 2010, in Brussels , Intel demonstrated
7560-774: The job. Controversial moderation decisions have included material relating to Holocaust denial , the Hillsborough disaster , Anthony Bourdain 's death, and the Notre-Dame fire . In July 2008, the Culture and Media Committee of the House of Commons of the United Kingdom stated that it was "unimpressed" with YouTube's system for policing its videos, and argued that "proactive review of content should be standard practice for sites hosting user-generated content". In June 2022, Media Matters ,
7665-579: The legal cost in select cases where they believe fair use defenses apply. In the 2011 case of Smith v. Summit Entertainment LLC , professional singer Matt Smith sued Summit Entertainment for the wrongful use of copyright takedown notices on YouTube. He asserted seven causes of action , and four were ruled in Smith's favor. In April 2012, a court in Hamburg ruled that YouTube could be held responsible for copyrighted material posted by its users. On November 1, 2016,
7770-442: The loss is acceptable," and, "You can almost get two people pulling on it at once and it won't break the fibre." They predicted that "Light Peak cables will be no more expensive than HDMI." In January 2011, Intel's David Perlmutter told Computerworld that initial Thunderbolt implementations would be based on copper wires. "The copper came out very good, surprisingly better than what we thought," he said. A major advantage of copper
7875-453: The maximum combined data rate cannot exceed 40 Gbit/s; video data will be using all needed speed, limiting PCIe data. DP 1.2 support is mandatory, while DP 1.4 is optional. Other overheads are possible on PCIe data (1.5% of 128b/130b is also removed) and Thunderbolt 3 protocol (you either optimise for speed or for latency), the last one gives only 21.6 Gbit/s to 25 Gbit/s. Thunderbolt 3 uses 64b/66b encoding after that, which means
7980-445: The need for a separate power supply from some devices. Thunderbolt 3 allows backwards compatibility with the first two versions by the use of adapters or transitional cables. Intel offers three varieties for each of the controllers: This follows previous practice, where higher-end devices such as the second-generation Mac Pro, iMac, Retina MacBook Pro, and Mac Mini use two-port controllers; while lower-end, lower-power devices such as
8085-409: The other end. A single Thunderbolt port supports up to six Thunderbolt devices via hubs or daisy chains ; as many of these as the host has DP sources may be Thunderbolt monitors . A single Mini DisplayPort monitor or other device of any kind may be connected directly or at the very end of the chain. Thunderbolt is interoperable with DP-1.1a compatible devices. When connected to a DP-compatible device,
8190-449: The physical level, the bandwidth of Thunderbolt 1 and Thunderbolt 2 are identical, and Thunderbolt 1 cabling is thus compatible with Thunderbolt 2 interfaces. At the logical level, Thunderbolt 2 enables channel aggregation, whereby the two previously separate 10 Gbit/s channels can be combined into a single logical 20 Gbit/s channel. Intel says Thunderbolt 2 will be able to transfer a 4K video while simultaneously displaying it on
8295-492: The platform at a rate of more than 500 hours of content per minute, and as of 2023 , there were approximately 14 billion videos in total. On the 9th of October 2006, YouTube was purchased by Google for $ 1.65 billion (equivalent to $ 2.31 billion in 2023). Google expanded YouTube's business model of generating revenue from advertisements alone, to offering paid content such as movies and exclusive content produced by and for YouTube. It also offers YouTube Premium ,
8400-450: The platform has been criticized for its facilitation of the spread of misinformation and copyrighted content , routinely violating its users' privacy , excessive censorship , endangering the safety of children and their well-being , and for its inconsistent implementation of platform guidelines. YouTube was founded by Steve Chen , Chad Hurley , and Jawed Karim . The trio were early employees of PayPal , which left them enriched after
8505-514: The price is 20 to 30 times that of copper Thunderbolt cables. German company DeLock also released optical Thunderbolt cables in lengths of 10 m (30 ft), 20 m (70 ft), and 30 m (100 ft) in 2013, priced similarly to the Sumitomo ones, and retailed only in Germany. In September 2013, glass company Corning Inc. released the first range of optical Thunderbolt cables available in
8610-414: The real rate is bigger than 40 Gbit/s, 2 times 20.625 Gbit/s. Intel's Thunderbolt 3 controller (codenamed Alpine Ridge, or the new Titan Ridge ) halves power consumption, and simultaneously drives two external 4K displays at 60 Hz (or a single external 4K display at 120 Hz, or a 5K display at 60 Hz when using Apple's implementation for the late-2016 MacBook Pros) instead of just
8715-447: The reason for the removal was, based on its internal research, that users often used the dislike feature as a form of cyberbullying and brigading . While some users praised the move as a way to discourage trolls , others felt that hiding dislikes would make it harder for viewers to recognize clickbait or unhelpful videos and that other features already existed for creators to limit bullying. YouTube co-founder Jawed Karim referred to
8820-401: The same time. An interface is thus a type definition; anywhere an object can be exchanged (for example, in a function or method call) the type of the object to be exchanged can be defined in terms of one of its implemented interface s or base-classes rather than specifying the specific class . This approach means that any class that implements that interface can be used. For example,
8925-563: The same year, YouTube announced it would start hiding dislike counts on videos, making them invisible to viewers. The company stated the decision was in response to experiments which confirmed that smaller YouTube creators were more likely to be targeted in dislike brigading and harassment. Creators will still be able to see the number of likes and dislikes in the YouTube Studio dashboard tool, according to YouTube. YouTube has an estimate 14 billion videos with about 5% of those never having
9030-455: The single display previous controllers can drive. The new controller supports PCIe 3.0 and other protocols, including DisplayPort 1.2 (allowing for 4K resolutions at 60 Hz). Thunderbolt 3 has up to 15 watts of power delivery on copper cables and no power delivery capability on optical cables. Using USB-C on copper cables, it can incorporate USB power delivery , allowing the ports to source or sink up to 100 watts of power. This eliminates
9135-514: The skit helped popularize YouTube's reach and led to the upload of more third-party content. The site grew rapidly; in July 2006, the company announced that more than 65,000 new videos were being uploaded every day and that the site was receiving 100 million video views per day. The choice of the name www.youtube.com led to problems for a similarly named website, www.utube.com . That site's owner, Universal Tube & Rollform Equipment , filed
9240-1312: The standard. In April 2019, Corning showed an optical Thunderbolt 3 cable at the 2019 NAB Show in Las Vegas . Just over a year later, in September 2020, Corning released their optical Thunderbolt 3 cables in lengths of 5 m (20 ft), 10 m (30 ft), 15 m (50 ft), 25 m (80 ft), and 50 m (160 ft). In the meantime, Taiwanese company Areca released optical Thunderbolt 3 cables in April 2020 in lengths of 10 m (30 ft), 20 m (70 ft), and 30 m (100 ft). Copper versions of Thunderbolt 4 cables offer full 40 Gbit/s speed and support backward compatibility with all versions of USB (up to USB4), DisplayPort Alternate Mode (DP 1.4 HBR3), and Thunderbolt 3. Released in early 2021, they were also to be available in three specified lengths: 0.2 m (0.66 ft), 0.8 m (2.6 ft), and 2 m (6.6 ft) – with many companies initially offering 0.8 m (2.6 ft) ones. Copper Thunderbolt 4 cables up to 1.0 m (3.3 ft) are passive cables, while longer cables must integrate active signal conditioning circuitry. 2 m (6.6 ft) maximum
9345-447: The system was "surprisingly resilient" in finding copyright violations in the audio tracks of videos, it was not infallible. The use of Content ID to remove material automatically has led to controversy in some cases, as the videos have not been checked by a human for fair use. If a YouTube user disagrees with a decision by Content ID, it is possible to fill in a form disputing the decision. Before 2016, videos were not monetized until
9450-440: The term interface is used to define an abstract type that acts as an abstraction of a class . It contains no data, but defines behaviours as method signatures. A class having code and data for all the methods corresponding to that interface and declaring so is said to implement that interface. Furthermore, even in single-inheritance-languages, one can implement multiple interfaces, and hence can be of different types at
9555-489: The testing and development of Thunderbolt devices. The developer kit is being provided only on request. In July 2011, Sony released its Vaio Z21 line of notebook computers that had a "Power Media Dock" that uses optical Thunderbolt (Light Peak) to connect to an external graphics card using a combination port that behaves like USB electrically, but that also includes the optical interconnect required for Thunderbolt. Thunderbolt 1 ran at 10 Gbit/s, making it faster than USB at
9660-957: The time. In June 2013, Intel announced that the next version of Thunderbolt, based on the controller code-named "Falcon Ridge" (running at 20 Gbit/s), is officially named "Thunderbolt 2" and entered production in 2013. The data-rate of 20 Gbit/s is made possible by joining the two existing 10 Gbit/s-channels, which does not change the maximum bandwidth, but makes using it more flexible. In June 2013, Apple announced Mac Pro (Late 2013) featuring six Thunderbolt 2 ports. In October 2013, Apple announced MacBook Pro (Retina, 13-inch, Late 2013) , and MacBook Pro (Retina, 15-inch, Late 2013) featuring two Thunderbolt 2 ports. In October 2014, Apple announced Mac mini (Late 2014) , and iMac (Retina 5K, 27-inch, Late 2014) featuring two Thunderbolt 2 ports. In March 2015, Apple announced MacBook Air (11-inch, Early 2015) , and MacBook Air (13-inch, Early 2015) featuring one Thunderbolt 2 port. At
9765-454: The two share Apple's physically compatible MDP connector. The Target Display mode on iMacs requires a Thunderbolt cable to accept a video-in signal from another Thunderbolt-capable computer. A DP monitor must be the last (or only) device in a chain of Thunderbolt devices. Intel announced they would release a developer kit in the second quarter of 2011, while manufacturers of hardware-development equipment have indicated they will add support for
9870-420: The types of content that is eligible to be monetized with advertising. YouTube contracts companies to hire content moderators, who view content flagged as potentially violating YouTube's content policies and determines if they should be removed. In September 2020, a class-action suit was filed by a former content moderator who reported developing post-traumatic stress disorder (PTSD) after an 18-month period on
9975-430: The update as "a stupid idea", and that the real reason behind the change was "not a good one, and not one that will be publicly disclosed." He felt that users' ability on a social platform to identify harmful content was essential, saying, "The process works, and there's a name for it: the wisdom of the crowds . The process breaks when the platform interferes with it. Then, the platform invariably declines." Shortly after
10080-447: The use of ad blockers violates its terms of service. In April 2024, YouTube announced it would be "strengthening our enforcement on third-party apps that violate YouTube's Terms of Service, specifically ad-blocking apps". YouTube has been led by a CEO since its founding in 2005, beginning with Chad Hurley , who led the company until 2010. After Google's acquisition of YouTube, the CEO role
10185-548: Was briefly exposed by Justin Timberlake during the halftime show. Karim could not easily find video clips of the incident and the 2004 Indian Ocean Tsunami online, which led to the idea of a video-sharing site. Hurley and Chen said that the original idea for YouTube was a video version of an online dating service and had been influenced by the website Hot or Not . They created posts on Craigslist asking attractive women to upload videos of themselves to YouTube in exchange for
10290-457: Was discontinued in January 2018 and relaunched in June, with US$ 4.99 channel subscriptions. These channel subscriptions complemented the existing Super Chat ability, launched in 2017, which allows viewers to donate between $ 1 and $ 500 to have their comment highlighted. In 2014, YouTube announced a subscription service known as "Music Key", which bundled ad-free streaming of music content on YouTube with
10395-411: Was estimated that visitors to YouTube spent an average of 15 minutes a day on the site, in contrast to the four or five hours a day spent by a typical US citizen watching television. In 2017, viewers on average watched YouTube on mobile devices for more than an hour every day. In December 2012, two billion views were removed from the view counts of Universal and Sony music videos on YouTube, prompting
10500-487: Was followed by separate agreements other major labels, which gave the company the right to advertising revenue when its music was played on YouTube. By 2019, creators were having videos taken down or demonetized when Content ID identified even short segments of copyrighted music within a much longer video, with different levels of enforcement depending on the record label. Experts noted that some of these clips said qualified for fair use. In June 2007, YouTube began trials of
10605-451: Was founded on February 14, 2005, by Steve Chen , Chad Hurley , and Jawed Karim , three former employees of PayPal . Headquartered in San Bruno, California , United States, it is the second-most visited website in the world, after Google Search . In January 2024, YouTube had more than 2.7 billion monthly active users , who collectively watched more than one billion hours of videos every day. As of May 2019 , videos were being uploaded to
10710-786: Was originally conceived as an optical technology, Intel switched to electrical connections to reduce costs and to supply up to 10 watts of power to connected devices. In 2009, Intel officials said the company was "working on bundling the optical fiber with copper wire so Light Peak can be used to power devices plugged into the PC." In 2010, Intel said the original intent was "to have one single connector technology" that would let "electrical USB 3.0 ... and piggyback on USB 3.0 or 4.0 DC power." Light Peak aimed to make great strides in consumer-ready optical technology, by then having achieved "[connectors rated] for 7,000 insertions, which matches or exceeds other PC connections ... cables [that were tied] in multiple knots to make sure it didn't break and
10815-862: Was retained. Salar Kamangar took over Hurley's position and kept the job until 2014. He was replaced by Susan Wojcicki , who later resigned in 2023. The current CEO is Neal Mohan , who was appointed on February 16, 2023. YouTube offers different features based on user verification, such as standard or basic features like uploading videos, creating playlists, and using YouTube Music , with limits based on daily activity (verification via phone number or channel history increases feature availability and daily usage limits); intermediate or additional features like longer videos (over 15 minutes), live streaming, custom thumbnails, and creating podcasts; advanced features like content ID appeals, embedding live streams, applying for monetization, clickable links, adding chapters, and pinning comments on videos or posts. In January 2012, it
10920-486: Was revealed that advertisements were being placed on extremist videos, including videos by rape apologists, anti-Semites, and hate preachers who received ad payouts. After firms started to stop advertising on YouTube in the wake of this reporting, YouTube apologized and said that it would give firms greater control over where ads got placed. University of North Carolina professor Zeynep Tufekci has referred to YouTube as "The Great Radicalizer", saying "YouTube may be one of
11025-514: Was rumored that the early-2011, MacBook Pro update would include some sort of new data port, and he speculated it would be Light Peak (Thunderbolt). At the time, there were no details on the physical implementation, and mock-ups appeared showing a system similar to the earlier Intel demos using a combined USB/Light Peak port. Shortly before the release of the new machines, the USB Implementers Forum (USB-IF) announced they would not allow such
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