YouTube is a video-sharing website, the site allows users to upload, view, and share videos.
Available content includes video clips, TV clips, music videos, movies(paid), and other content such as video blogging, short original videos, and educational videos.
Everything on Youtube, except Movies (https://www.youtube.com/user/movies) and some channels (https://www.youtube.com/channels/paid_channels), is free. More Info »
YouTube makes use of WebM, H.264/MPEG-4 AVC, and Adobe Flash Video technology to display a wide variety of user-generated and corporate media video.