The PICT file type is primarily associated with Macintosh by Apple Inc. QuickDraw is the 2D graphics library and associated Application Programming Interface (API) which is a core part of the classic Apple Macintosh operating system. It was initially written by Bill Atkinson and Andy Hertzfeld. QuickDraw still exists as part of the libraries of Mac OS X, but has been largely superseded by the more modern Quartz graphics system.