YouTube earns advertising revenue from Google AdSense, a program which targets ads according to site content and audience.

Videos deemed potentially inappropriate are available only to registered users affirming themselves to be at least 18 years old. Unregistered users can only watch videos on the site, while registered users are permitted to upload an unlimited number of videos and add comments to videos. Most of the content on YouTube is uploaded by individuals, but media corporations including CBS, the BBC, Vevo, and Hulu offer some of their material via YouTube as part of the YouTube partnership program.

Available content includes video clips, TV show clips, music videos, short and documentary films, audio recordings, movie trailers, live streams, and other content such as video blogging, short original videos, and educational videos. It offers a wide variety of user-generated and corporate media videos.

YouTube allows users to upload, view, rate, share, add to favorites, report, comment on videos, and subscribe to other users. Google bought the site in November 2006 for US$1.65 billion YouTube now operates as one of Google's subsidiaries. The service was created by three former PayPal employees-Chad Hurley, Steve Chen, and Jawed Karim-in February 2005. YouTube is an American video-sharing website headquartered in San Bruno, California.