Portable Document Format

The Portable Document Format (PDF) is the file format created by Adobe Systems, in 1993, for document exchange. PDF is used for representing two-dimensional documents in a device-independent and display resolution-independent fixed-layout document format. Each PDF file encapsulates a complete description of a 2-D document (and, with Acrobat 3-D, embedded 3-D documents) that includes the text, fonts, images, and 2-D vector graphics that compose the document. - From the Wikipedia entry for PDF: http://en.wikipedia.org/wiki/Portable_Document_Format