This is a format for compact font storage in the OpenType system, allowing for the rasterization of text information. It differs from TrueType in its abilities to describe font symbols and with its font structure variation algorithm, depending on the change in size. CFF allows for increased screen clarity with high resolution, but this is not due to the font, but its rasterization.
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.