M4A - Audio-only MPEG-4

Format introduction:

MPEG-4 Part 14 or MP4 is a digital multimedia container format most commonly used to store video and audio, but can also be used to store other data such as subtitles and still images. M4A stands for MPEG 4 Audio and is a filename extension used to represent audio files.

Technical details:

Audio-only MPEG-4 files generally have a .m4a extension. This is especially true of non-protected content. M4A is often compressed using AAC encoding (lossy), but can also be in Apple Lossless format.

 

File extension	.m4a
MIME	video/mp4
Developed by	International Organization for Standardization
Type of format	Media container
Associated programs	Windows Media Player, RealPlayer, MPlayer, Media Player Classic, VLC Media Player, K-Multimedia Player
Sample file	sample.m4a
Wiki	M4A on Wikipedia