Definition:
OpenType fonts are the current standard in fonts. In an OpenType font, both the screen and printer font is contained in a single file (similar to TrueType fonts). They also allow for an extremely large character set, meaning that same single file can contain additional characters, languages and figures that might previously have been released as separate files.
Additionally, a single OpenType font files is compatible on both Windows and Mac. These features make OpenType fonts easy to manage and distribute.
OpenType fonts were created by Adobe and Microsoft, and are currently the primary font format available. However, TrueType fonts are still widely used.
Sources: Adobe.com
Also Known As: .otf file
Common Misspellings: Open Type Font