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The MP3 :
MP3, short for MPEG Audio Layer 3, is a digital audio compression technique that compresses an audio file (such as CDA, WAV, or AU) to about one-fifth of its original size. For example, this technique would compress a 30MB WAV file down to a 6MB MP3 file. You can compress even further to get the file down to 4.5MB; however, the quality of the audio decreases as the file is further compressed. For technical information about MP3 technology, including a glossary of related terms and MP3-related downloads, see the MP3 Converter web site.