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Compression

Compression: To reduce in size. The amount of storage space required to store data can be reduced if the data is compressed. Compression can be achieved either without loss of information (called lossless) or may result in some loss of information (called lossy). Lossy compression algorithms typically allow a choice between low compression and low data loss or high compression with correspondingly higher data loss. Lossless compression is used for compressing where no data loss can be tolerated, for example when compressing applications or application data. Lossy compression is used where some data loss can be tolerated and is typically used for images, for example jpeg and mpeg are lossy image compression techniques.

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