A PDF File is a file format used to represent document in a manner independent of application software, hardware, and operating system.
PDF stands for Portable
Document Format. PDF was developed in the
early 1990s as a way to share documents, including text formatting and inline
images, among computer users of disparate platforms who may not have access to
mutually-compatible application software. 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. In 1991, Adobe Systems co-founder John Warnock outlined a system called ‘Camelot’ that evolved into PDF.