H.264, also known as MPEG-4 PART 10 or AVC (Advanced Video Coding) is a video codec capable of achieving high video quality in lower bitrates than previously possible. The first version of the standard was completed in 2003 and since then this codec has become the standard for all video compression. Developed for the purposes of high definition video, in particular Bluray, HDTV and the now obsolete HD DVD, H.264 is capable of reducing the size of files containing HD material.
Any file extension, for example avi, mp4, m4v and mkv are all capable, and nowadays likely to all be coded as H.264.
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