This allows a large reduction in file sizes when compared to uncompressed audio. About audio compression (the aspect of the standard most apparent to end-users, and for which it is best known), MP3 uses lossy data compression to encode data using inexact approximations and the partial discarding of data. MP3 (or mp3) as a file format commonly designates files containing an elementary stream of MPEG-1 Audio or MPEG-2 Audio encoded data, without other complexities of the MP3 standard. Similar to this format is M4A, which is also an iTunes Audio file, but one that isn't copy protected. It's just an AAC file that's copy-protected using a proprietary DRM technology created by Apple.M4P files are seen when downloading music from the iTunes Store. A file with the M4P file extension is an iTunes Audio file or sometimes called an iTunes Music Store Audio file.
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