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An MP3 file is a compressed audio file, which uses lossy compression make it possible to store many files with limited occupied space. Compression of 1/10th is typically achieved at minimal loss in quality, to the point where most people cannot tell the difference between an uncompressed wav file taken from a CD and a properly compressed mp3. The quality and size of mp3 files obtained online can vary radically depending on the encoder used, the intent of the encoder, and the skill of the individual doing the encoding. Some mp3 audio files are crisp, clean, and sound excellent. Some mp3 files are digital distortion garbage.The use of lossy compression is designed to greatly reduce the amount of data required to represent the audio recording and still sound like a faithful reproduction of the original uncompressed audio for most listeners. The compression works by reducing accuracy of certain parts of sound that are considered to be beyond the auditory resolution ability of most people. MP3 was designed by the Moving Picture Experts Group (MPEG) as part of its MPEG-1 standard and later extended in the MPEG-2 standard. The first mp3 software became public in 1994 and was called l3enc. Winamp, the most widely known mp3 player for the Microsoft Windows operating system became available to the public in 1997. The underground music trade kicked off in the late 1990s and still thrives today.