YouTube is a video-sharing website headquartered in San Bruno, California, United States. The service was created by three former PayPal employees in February 2005. In November 2006, it was bought by Google for US$1.65 billion. [source]
How to download videos from YouTube
1. Copy a supported YouTube url from your browsers address bar (see above for some examples).
2. Paste the url into the box above and click the Download button.
3. A list with several download links will appear. Each link represents a different video quality.
4. Choose a quality and click the download link.