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An mp4 (MPEG-4) is a file format which can contain audio and/or video. They are smaller and of higher quaility than mp3's and absorb many of the features of MPEG-1 and MPEG-2 adding additional 3D rendering and advanced interactivity. Overall mp4's are good but unfortunately it seems that very few people know what they are and even fewer people know what they do. I've heard others describe them as "downloaded videos",this is a fairly good description allthough they have other uses beyond being downloaded.
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