From The Free On-line Dictionary of Computing (19 January 2023):
Portable Document Format
PDF
<file 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.
(http://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)