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Terminology Description
CODEC (or Codec)

CODEC stands for compression / decompression. A codec is a small program which allows Windows to compress and/or decompress audio to and from certain formats

Compression

The process of reducing the dynamic range of a given analog audio program by making the

loud parts quieter and the quiet parts louder. A means of encoding a digital file so that it

occupies a smaller amount of disk space than the data contained within the file. In order to

make use of a compressed file, one must employ a codec (coder-decoder)