Lossy
From GPWikiA lossy compression algorithm (as opposed to a lossless algorithm) achieves its space savings by sacrificing the least critical portions of data. A lossy compression algorithm is not fully revisible, and decompression will not result in an exact copy of the original data. However, lossy algorithms are still of great use to us, as often the results of compression/uncompression are indistinguishable to the human eye (as in JPEG files) or ear (as in MP3 files). Some examples of lossy compression algorithms are:
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