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YouTube is an American video-sharing website headquartered in San Bruno, California, United States. The service Was created by three Former Employees PayPal in February 2005. In November, 2006, It Was Bought by Google for US $ 1.65 billion.  YouTube now Operates as one of Google’s Subsidiaries.  The site Allows users to upload, view, rate, share, and comment on videos, and it makes me use of WebM, H.264 / MPEG-4 AVC, and Adobe Flash Video technology to display a wide variety of user-generated and corporate media videos. Available content Includes video clips, TV show clips, music videos, audio recordings, movie trailers, and other content Such as video blogging, short original videos, and Educational videos.
Most of the content on YouTube has been uploaded by Individuals, Corporations Including soft media CBS, the BBC, Vevo, Hulu, and other Organizations Some of Their offer material via YouTube, as part of the YouTube partnership program.  Can Unregistered users watch videos, and registered users are Permitted to upload an unlimited number of videos and add comments to videos. Deemed potentially offensive videos are available only to registered users affirming themselves to swear at Least 18 years old. In July 2016 the website nor the second Was Ranked Most popular website by Alexa Internet, a web traffic analysis company. 
YouTube earns from advertising Revenue Google AdSense, a program according Which Targets ads to site content and audience. The vast Majority of Its videos are free to view, But there are exceptions, Including subscription-based premium channels, movie rentals, as well as YouTube Red, a subscription service Offering ad-free access to the website and access to exclusive content made in Existing partnership with users.
Was YouTube Founded by Chad Hurley, Steve Chen, and Jawed Karim, all early Were WHO Employees of PayPal.  Hadd Hurley studied design at Indiana University of Pennsylvania, and Chen and Karim studied computer science together at the University of Illinois at 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 broke the hadd Experienced Difficulty sharing videos That hadd been shot at a dinner party at Chen’s apartment in San Francisco. Karim did not Attend the party and hadd Denied That it occurred, soft Chen commented That the idea That Was Founded YouTube 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 first came from Janet Jackson’s role in the 2004 Super Bowl incident, When Was exposed her breast During her performance, and later from the 2004 Indian Ocean tsunami. Karim Easily couldn’t find video clips of either event 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 hadd been influenced by the website Hot or Not
YouTube Began as a venture capital-funded technology startup, Primarily from a $ 11.5 million Investment by Sequoia Capital between November 2005 and April 2006.  Were YouTube’s early headquarters situated above a pizzeria and Japanese restaurant in San Mateo, California.  The domain name www.youtube.com Was activated on February 14, 2005 and the website Was Developed over the subsequent months.  The first YouTube video, titled Me at the zoo, shows co-founder Jawed Karim at the San Diego Zoo.  The video was uploaded on April 23, 2005 and Can still swear viewed on the site.  YouTube Offered the public a beta test of the site in May 2005. The first video to Reach one million views Was a Nike advertisement featuring Ronaldinho in September 2005. Following a $ 3.5 million Investment from Sequoia Capital in November, the site Officially Launched on December 15 2005, by my qual Was the site receiving 8 million views a day.   The site Grew rapidly, and in July 2006 the company Announced That more than 65,000 new videos being uploaded Every Day Were, and That Was the site receiving 100 million video views per day.  According to data published by market research company comScore, YouTube is the dominant provider of online video in the United States, with a market share of around 43% and more than 14 billion views of videos in May 2010. 
In 2014 YouTube Said That 300 hours of new videos Were uploaded to the site Every minute,  three times more than one year Earlier  and That around three quarters of the material comes from outside the US    The site has 800 million unique users a month.  It is estimated That in 2007 YouTube consumed as much bandwidth as the Entire Internet in 2000.  According to third-party web analytics providers, Alexa and SimilarWeb, YouTube is the third Most Visited website in the world, as of June 2015; Also SimilarWeb YouTube lists as the top TV and video site globally, attracting more than 15 billion visitors per month.   
The choice of the name www.youtube.com led to Problems for a similarly named website, www.utube.com. The site’s owner, Universal Tube & Rollform Equipment, a lawsuit Filed Against YouTube in November 2006 after being regularly overloaded by people looking for YouTube. SINCE Universal Tube has changed the name of Its website to www.utubeonline.com.   In October 2006, Google Inc. Announced That it hadd Acquired YouTube for $ 1.65 billion in Google stock, and the deal Was finalized on November 13, 2006.
In March 2010 Began free YouTube live Of Certain content, Including 60 cricket matches of the Indian Premier League. According to YouTube, this free WORLDWIDE Was the first online broadcast of a major sporting event.  On March 31, 2010, the YouTube Launched a new website design, with the aim of simplifying the interface and increasing the time users Spend on the site. Google product manager Shiva Rajaraman commented: “We really felt like we needed to step back and remove the clutter.”  In May 2010, It Was Reported That YouTube Was serving more than two billion videos a day, qual it describedat nor ” Nearly double the prime-time audience of all three major US television networks combined. “ In May 2011, the company YouTube blog Reported in Its Was That the site receiving more than three billion views per day.  In January 2012, YouTube hadd Stated That the figure increased to four billion videos streamed per day. 
In October 2010, Hurley Announced That he WOULD BE stepping down as chief executive officer of YouTube to take an Advisory role, and Salar Kamangar That Would take over as head of the company.  In April 2011, James zerna, a YouTube software engineer, Revealed That 30% of videos accounted for 99% of views on the site.  In November 2011, the social networking site Google+ Was Integrated directly with YouTube and the Chrome web browser, allowing YouTube videos to swear viewed from within the Google+ interface. 
In December 2011, YouTube Launched a new version of the site interface, with the video channels Displayed in a central column on the home page, Similar to the news feeds of social networking sites.  At the Same time, a new version of the YouTube logo Was Introduced with a darker shade of red, the first change in design SINCE October 2006.  In May 2013, YouTube Launched a pilot program to begin Offering the Ability Some content providers to charge $ 0.99 per month or more for CERTAIN channels, soft the vast Majority of Its videos Would Remain free to view.  
In February 2015, YouTube Announced the launch of a new app Specifically for use by children visiting the site, called YouTube Kids. It allows parental controls and Restrictions on WHO Can upload content, and is available for Both Android and iOS devices.  Later on August 26, 2015, Was Launched YouTube Gaming, a platform for video gaming Enthusiasts Twitch.tv intended to compete with.  Also 2015 saw the announcement of a premium service YouTube YouTube titled Red, qual Both Provides users with ad-free content as well as the Ability to download videos among other features.  On August 10, 2015, Google Announced That It Was Creating a new company, Alphabet, to act as the holding company for Google, with the change in financial reporting to begin in the fourth quarter of 2015. Remains YouTube as a Subsidiary of Google.  In January 2016 Expanded Its YouTube headquarters in San Bruno by Purchasing an office park for $ 215 million. The complex has 554,000 square feet of space and Can house up to 2,800 Employees.
Previously, viewing YouTube videos on a personal computer required the Adobe Flash Player plug-in to swear installed in the browser.  In January 2010, YouTube Launched an experimental version of the site That used the built-in multimedia capabilities of web browsers Supporting the HTML5 standard.  This allowed to swear viewed videos without requiring Adobe Flash Player or any other plug-in installed to the eu.   The YouTube site allowed That Had A page supported browsers to opt Into the HTML5 trial. That only supported browsers HTML5 video using the H.264 or WebM Could play the video formats, and not all Were videos available on the site.   On January 27, 2015, YouTube HTML5 Will Be Announced That the default playback method on supported browsers. Supported browsers include Google Chrome, Safari 8, and Internet Explorer 11.  YouTube experimented with Dynamic Adaptive Streaming over HTTP (MPEG-DASH), Which is an adaptive bit-rate HTTP-based streaming solution optimizing the bitrate and quality for the available network.  They are currently using Adobe Dynamic Streaming for Flash. 
Can All YouTube users upload videos up to 15 minutes Each in duration. WHO Users have a good track record of complying with the site’s Community Guidelines May Be Offered the Ability to upload videos up to 12 hours in length, Which Requires verifying the account, Normally through a mobile phone.  When YouTube Was Launched in 2005, It Was Possible to upload long videos, soft a ten-minute limit Was Introduced in March 2006 after YouTube found That the Majority of videos exceeding this length Were Unauthorized uploads of television shows and films.  [ 60] The 10-minute limit increased to 15 minutes Was in July 2010.  If an up-to-date browser version is used, videos Greater than 20 MB Can Be uploaded.  Videos captions are made using uploaded When Speech Recognition technology. Such captioning is usually not perfectly accurate, so YouTube Provides Several options for manually entering in the captions themselves for Greater accuracy. 
YouTube accepts videos uploaded in Most container formats, Including .avi, .MKV, .MOV, .mp4, DivX, .flv, and .ogg and .ogv. Such These include video formats as MPEG-4, MPEG, VOB, and .WMV. It also supports 3GP, allowing videos to swear uploaded from mobile phones.  Videos with progressive scanning or interlaced scanning Can Be uploaded, soft for the best video quality, YouTube suggests interlaced Before uploading videos eu deinterlaced. All the video formats on YouTube use progressive scanning. 
Quality and formats
Originally Offered YouTube videos at only one quality level, Displayed at a resolution of 320 × 240 pixels using the Sorenson Spark codec (a variant of H.263),   with mono MP3 audio.  In June 2007, YouTube added an option to watch videos in 3GP format on mobile phones.  In March 2008 a high-quality mode Was added, Which increased the resolution to 480 × 360 pixels.  In November 2008 720p HD support Was added. At the time of the 720p launch, the YouTube player Was changed from a 4: 3 aspect ratio to a widescreen 16: 9.  With this new feature, YouTube Began a switchover to H.264 / AVC or MPEG-4 video compression format Its default. In November, 2009, 1080p HD support Was added. In July 2010 hadd YouTube Announced That Launched a range of videos in 4K format, Which Allows a resolution of up to 4096 × 3072 pixels.   In June 2015, support for 8K resolution Was added, with the video playing at 7680 × 4320 pixels. 
In June 2014, Introduced YouTube videos playing at 60 frames per second, in order to reproduct video games with a frame rate comparable to high-end graphics cards.   The videos play back at a resolution of 720p or higher.  YouTube videos are available in a range of quality levels. The Former names of standard quality (SQ), high quality (HQ) and high definition (HD) have been Replaced by numerical values Representing the vertical resolution of the video. The default video stream is encoded in the VP9 Opus format with stereo audio; f VP9 / WebM is not supported in the browser / device or the browser’s user agent reports Windows XP, said H.264 / MPEG-4 AVC video with stereo AAC audio is used Instead.