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The OpenType font format is an extension of the TrueType font format, allowing support for PostScript font data. Technically there are two OpenType Font flavors; TrueType based and PostScript based.  OpenType was developed jointly by Microsoft and Adobe to produce a hybrid between Type 1 and TrueType fonts, with additional features that work on Macintosh and Windows computers. OpenType fonts can include OpenType layout features, which allow font designers to design better international and high-end typographic fonts.

Some descriptions (of various fields in this document) are copied from the specification available online at: