OpenType

OpenType is an outline font format developed by Microsoft and Adobe. It is the successor to both TrueType and Adobe Type 1 font formats.

Identification
files containing "CFF data" begin with ASCII "" (4F 54 54 4F), whereas files containing TrueType outlines begin with the bytes 00 01 00 00.

Specifications

 * OpenType specification

Sample files

 * http://tug.ctan.org/tex-archive/fonts/cm-unicode/fonts/otf/

Links

 * Wikipedia article
 * Adobe's OpenType FAQ