Portable Document Format
.The Portable Document Format (PDF) is a file format for storing documents on a computer. Adobe created it in 1993 to make it easier to exchange documents. PDF is often used to make documents print-ready. PDF documents can have stylised text and images in them.
The document is stored in such a way that the content does not change the way it looks on different screens, computers and printers as can happen with other file formats.