AVI, short for Audio Video Interleave, is a multimedia container format. An AVI file contains audio and video data in a file and it supports synchronous audio-with-video playback. It's uncompressed, and it’s supported by most players and devices. In contrast, the MPEG (Moving Picture Experts Group) file is compressed. MPEG is the default format when burning DVDs, and it’s widely used in video recording. For more information, read this post: AVI to MPEG: What’s the Difference & How to Convert.