Portable Document Format (PDF) is an open standard for document exchange.

This file format created by Adobe Systems in 1993 is used for representing documents in a manner independent of application software, hardware, and operating systems. Each PDF file encapsulates a complete description of a fixed-layout flat document, including the text, fonts, graphics, and other information needed to display it.

Source: http://en.wikipedia.org/wiki/Portable_Document_Format

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