Shorten (SHN) is a file format similar to ZIP, RAR, an StuffIt but is optimized for compressing audio data. It is a form of lossless data compression of files and is used to losslessly compress CD-quality audio files (44.1 kHz 16-bit stereo PCM). Shorten is no longer developed and more mature lossless audio codecs such as FLAC, MPEG-4 ALS, Monkey's Audio (APE), TTA, and WavPack have become more popular (especially due to early versions of Shorten not having support for seek tables). However, Shorten remains a common format due to the large number of legally tradable concert recordings in circulation that are encoded as Shorten files. Shorten files use the .SHN file extension.