This article lists the video format (ie data structure used in video).
MP4 is a standard developed by the Moving Picture Experts Group (MPEG);
The MPEG-4 format compress
Can store data along the video such as:
MPEG Video format is standard developed by the Moving Picture Experts Group (MPEG) compressed using:
If you'd like to back up videos in CD/DVD, you probably need MPEG format.
The m3u M3U file is a playlist file format used often to point to a stream on the Internet (ie a file splitted into multiple files)