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| Name | M4B |
| Full name | MPEG-4 Audio Layer Bookmarkable File |
| File extension | .m4b |
| MIME type | audio/m4b |
| Developed by | Apple |
| Type of format | Music File |
| Description | Audiobook and podcast files which also contain metadata including chapter markers, images, and hyperlinks can use the extension .m4a but more commonly use the .m4b extension. M4b files support metadata for chapters and bookmarking on supporting players and most commonly uses AAC (Advanced Audio Codec). |
| Technical details | The audio in a M4b file is encoded with the AAC compression format and can therefore be protected with Apple's FairPlay DRM copy protection system. M4b files can contain metadata as defined by the format standard and in addition can contain Extensible Metadata Platform (XMP) metadata. |
| Associated programs | Apple QuickTime Player, Apple iTunes |
| Wiki | https://en.wikipedia.org/wiki/MPEG-4_Part_14 |