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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.
For a technical overview of the features of the Windows Media codecs, see About the Windows Media Codecs. The term codec is an amalgamation of the terms compressor and decompressor. A codec is usually implemented as a pair of COM objects: one for encoding content, and another for decoding content.