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MPEG1 is the standard MPEGs you see videos using.
MPEG2 is what they use for Digital Television, DVDs, and satellite broadcasting.
WMV is what Microsoft is best known for doing, taking someone else's idea and making it their own. WMV is based off of MPEG1. Same with RealMedia and Quicktime.
MPEG4 is like MPEG1 but is made to encompass all types of media, like text, animation, interactive buttons, etc.
There's also MPEG7 and MPEG21...
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