Mac OS X supports many font formats:

• PostScript (Type1): Represents fonts as mathematical outlines and splits the font data into various files.
• TrueType (Mac): Represents fonts as mathematical outlines and stores all information in one file. Not compatible with PCs.
• TrueType (PC): Same as TrueType (Mac) but works on PCs.
• Data-Fork Suitcase (TrueType): Same as TrueType Mac, except that the information is stored in the data fork instead of the resource fork. Not compatible with PCs.
• Apple Advanced Typography (TrueType): Extended TrueType format, similar to OpenType.
• OpenType (PostScript flavored): Mostly contains many more characters than PostScript or TrueType fonts.
• OpenType (TrueType flavored): Mostly contains many more characters than PostScript or TrueType fonts.
• TrueType Collection: A TrueType Collection (TTC) is a means of delivering multiple OpenType fonts in a single file structure.