In 1997 the OpenType font specification was released as an extension to the TrueType format. OpenType was developed jointly by Microsoft and Adobe to end their font war. It comes with support for PostScript Type 1 data and advanced layout features, which allow font designers to design better international and high-end typographic fonts.
Even though OpenType fonts can contain either PostScript Type 1 or TrueType outlines, it is a common mistake to talk about TTF and OTF to diverse between the two outline formats.
TrueType has been superseded by the OpenType format, but people still refer to TrueType fonts, while in fact 99.9% of all fonts that come with Windows are OpenType fonts.
See also: http://forum.high-logic.com/viewtopic.php?f=5&t=1619
FontCreator fully supports OpenType fonts. You can either draw your glyph outlines with quadratic or cubic curves. Use the OpenType Designer to add advanced OpenType layout features to your fonts.
More information about the OpenType font specification:
