This was created for the Mac OS X operating system. Unlike the old operating environment versions, the font is stored in the thread of a data file instead of in resource threads. It’s been used as a container for TrueType fonts since 2009 after the release of Mac OS X 10.6, and is gradually replacing the TrueType Collection.
This was developed by the Adobe Company and contains data regarding the metric characteristics of Type 1 PostScript fonts. The AFM structure requires a control template that defines the look of every font symbol. It’s used primarily for UNIX.