The site has also introduced advertising to videos, reaping profits for its owners Google and the uploaders of popular videos. Initially hosting user created content, the site has diversified, signing deals with television channels to host their catch up services, such as the UK's Channel 4 service 4oD. The site reportedly streams 4 billion videos to its users everyday, with 48 hours of content being uploaded every minute. Since its launch in 2005, YouTube has grown to become the most popular website for users to stream or share video.

Detailed information on the MP4 File Format.

The only official filename extension for MPEG-4 Part 14 files is. A separate hint track is used to include streaming information in the file.

Like most modern container formats, MPEG-4 Part 14 allows streaming over the Internet.

It is most commonly used to store digital video and digital audio streams, especially those defined by MPEG, but can also be used to store other data such as subtitles and still images. MPEG-4 Part 14 or MP4, formally ISO/IEC 14496-14:2003, is a multimedia container format standard specified as a part of MPEG-4. Since stores like iTunes uses this container format, and it is used with iPod and PlayStation Portable (PSP), MP4 files have become more common. MP4 is a container format that can store video, audio and subtitle data (as well as more depending on content). MP4 files (MPEG-4 Part 14) are multimedia files.

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