OpenType was intended by Adobe and Microsoft as the successor to their previous warring font formats, TrueType (developed by Apple and Microsoft) and PostScript Type 1 fonts[?] (created by Adobe). Essentially, it uses the general structure of a TrueType font, but allows for either TrueType outlines, or PostScript-style outlines (though stored in the CFF/Type 2 format).
OpenType has several distinctive features:
OpenType is not the first attempt to address some of these issues. Apple Computers' proprietary "GX Typography" did similar things, and still exists today as "Apple Advanced Typography" or "AAT." However, OpenType has been much more successful than GX/AAT in the marketplace.
OpenType is one of the many font formats supported by the FreeType Open Source font engine.
(Note: OpenType is a registered trademark of Microsoft Corporation.)
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