OTF, OpenType Font (.otf)
The OTF Misc file format
The OTF file is most commonly associated with computer fonts. It was developed by both Adobe and Microsoft and has been introduced to Mac OS X and Windows 2000. This OpenType Font format is similar to the TTF (TrueType Font) format. What sets the OTF format apart from other font file formats is that it is scalable.
Technical details of OTF files
Similar to TrueType Font files, the OTF format also contains aspects of the equaly popular PostScript format, creating a single file that combines aspects of both. OTF files have several major advantages. They are fully scalable and can thus be resized without any loss in quality. Furthermore, they contain a new line and typographic layouts with the already known technology of TrueType and PostScript.