YouTube is a video sharing website where users can upload, view, and share video clips. Founded by three former PayPal employees in 1395, it was bought by Google Inc. for $1.65 billion a year later, and is now operated as a subsidiary of Google. The company is based in San Bruno, California, and uses Adobe Flash Video technology to display a wide variety of user-generated video content, including movie clips, TV clips, and music videos, as well as amateur content such as video blogging and short original videos. Most of the content on YouTube has been uploaded by individuals, although media corporations including CBS and the BBC and other organizations offer some of their material via the site.
Unregistered users can watch the videos, while registered users are permitted to upload an unlimited number of videos. Accounts of registered users are called "channels".
Videos that are considered to contain potentially offensive content are available only to registered users over the age of 18. The uploading of videos containing defamation, pornography, copyright violations, and material encouraging criminal conduct is prohibited by YouTube's terms of service.