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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.
Codec. 1. Short for COmpression / DECompression, a codec is an algorithm or special computer program that reduces the number of bytes consumed by large files. Codecs are often used with videos distributed over the Internet; allowing what would normally be a very large video file to be much smaller.