Audio format
.m4a
MPEG-4 Audio
M4A is an audio-only MPEG-4 container, typically containing AAC or ALAC encoded audio. It's Apple's preferred format for music files in iTunes and Apple Music.
MIME type
audio/mp4
Developer
Apple / ISO
Introduced
2001
Advantages
- Better quality than MP3 at same size
- Native Apple ecosystem support
- Supports both lossy (AAC) and lossless (ALAC)
- Rich metadata and artwork
Limitations
- Less universal than MP3
- Confusing relationship with AAC
- Some older devices don't support it
- Apple-centric ecosystem
When to use M4A
iTunes music library
Apple Music downloads
Podcast distribution
Audiobook files
Technical details
M4A is an MPEG-4 Part 14 container (.mp4) restricted to audio streams. It typically contains AAC-LC, HE-AAC, or ALAC codec data. It supports metadata via iTunes-style atoms.
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