AVI is a Microsoft-defined file format, Audio Video Interleave. It's basically a container for audio and video that may be encoded in an arbitrary format. The most popular now being implementations of MPEG4 like DivX for video and probably still MPEG layer 3 for audio (i.e. MP3).
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"Prohibition will work great injury to the cause of temperance. It is a species of intemperance within itself, for it goes beyond the bounds of reason in that it attempts to control a man's appetite by legislation, and makes a crime out of things that are not crimes. A Prohibition law strikes a blow at the very principles upon which our government was founded." --Abraham Lincoln
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