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Compression

Compressing digital data means removing redundancies so that it takes up less space. There are two main forms of compression,lossy andlossless.Lossless compression only takes away a certain amount of data so that it can be returned to its original complete state.Lossy compression however, will sacrifice more data to produce better compression.MPEG-4 is a lossy compression that can keep high quality but can reduce the amount of space a video file needs tremendously.