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Video codecs are used in DVD and video CD players and recorders, video broadcast systems, personal computers, and a variety of other applications. In particular, they are widely used in applications that record or transmit video, which may not be feasible with the high data volumes and bandwidths of uncompressed video.
ANS: AVI is not in itself a codec; it is a common  container format  that many different codecs can use. As there are hundreds of codecs out there are compatible with AVI content, it can get very confusing which codec(s) you will need to play your video files.t also stands for compressor/decompressor and code/decode. All of these variations mean the same thing: a codec is a computer program that both shrinks large movie files, and makes them playable on your computer. Codec programs are required for your media player to play your downloaded music and movies.