Source : Free On-Line Dictionary of Computing

Portable Document Format
     
         (PDF) The native file format for {Adobe
        Systems}' {Acrobat}.  PDF is the file format for representing
        documents in a manner that is independent of the original
        application software, hardware, and operating system used to
        create those documents.  A PDF file can describe documents
        containing any combination of text, graphics, and images in a
        device-independent and {resolution} independent format.  These
        documents can be one page or thousands of pages, very simple
        or extremely complex with a rich use of {fonts}, graphics,
        colour, and {images}.
     
        {Home (http://www.adobe.com/products/acrobat/adobepdf.html)}.
     
        ["The Portable Document Format Reference Manual", Adobe
        systems, Inc. Addison-Wesley Publ.  Co., ISBN: 0-201-62628-4].
     
        (2000-09-08)