AVI is a multimedia container format containing both video and audio data in a file container that allows synchronous audio-with-video playback, and it's not a specific type of file and there are various codecs for AVI videos including MPEG-4, MPEG-3, MPEG-1, MPEG-H, MPEG-HD, Xvid, DivX, Cinepak, Indeo, DV, MJPEG, etc.
