- A class of data compression algorithms that allows the original data to be perfectly reconstructed from the compressed data. Lossless compression is used in cases where it is important that the original and the decompressed data be identical, or where deviations from the original data would be unfavorable. Typical examples are executable programs, text documents, and source code. Some image file formats, like PNG or GIF, use only lossless compression. ← Wikipedia
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