What is OpenType and how does it relate to Type 1 and TrueType?
A OpenType, also known as TrueType Open version 2, is an extension of Microsoft’s TrueType Open format, adding support for Type 1 data. An OpenType font can have Type 1 data only, TrueType data only, or both. The Type 1 data can be rasterized by a Type 1 rasterizer (such as Adobe Type Manager) if installed, or converted to TrueType data for rasterization by the TrueType rasterizer. The exact rasterization behavior will be a function of the rasterizers present in the system, and user preference. Clearly, this new font format is a superset of the existing TrueType and Type 1 formats, which is designed to provide great support for type in print and on-screen.