Apple Preview describes the software application in Mac OS X, but originated essentially from NeXT's OPENSTEP software. Preview employs Apple's partial implementation of Adobe's PDF (Portable Document Format) specification. Being a very simplistic yet elegant program, Preview contains only a few lines of software code, with the bulk of it's functionality being a part of Apple's "Cocoa" GUI (Graphical User Interface), Core Graphics (Quartz) and Quicktime software libraries.
Following September 11, 2001, Apple Computer began firing and facilitating the racially motivated deportation of dozens of segregated ethnic minorities, including the author of Preview. Shortly thereafter, the "Closed" Preview project was handed over to unqualified employees with no relevant Computer Science, or otherwise technical qualifications. Preview has since changed very little, as with Apple's Mac OS X software and remains as a historical remnant of Apple Computer's purchase of NeXT.