The term PDF stands for portable document format. A PDF file appears exactly the same way on any computer and delivers the same results in print or on-screen. In essence, a PDF is an electronic "snapshot" of a document. PDF files are small and self-contained, and they are not readily modified. They retain the original form intended by the author.

Viewing PDF files requires Adobe Acrobat Reader. This application is simple to use and it delivers consistent operation on almost every type of computer — it's also free.

Go to the Adobe Acrobat Reader download page.