M4A is an Apple lossless audio file, which is compressed with ALE (Apple Lossless Encoder). In addition, the M4A file uses ALAC, or Apple Lossless Audio Codec, which uses lossless compression, meaning you do not lose sound quality when you encode it into another audio format. You typically find an M4A file in the Apple iTunes store or on P2P programs such as FrostWire. If you suspect your M4A is corrupt, you can fix a broken M4A file to recover the audio file. Writer Bio
