PDF is probably one of the most common document file you can find on the internet after HTML. Lots of government forms and applications are stored in this format.

“Portable Document Format” was created by Adobe Systems in 1993 to facilitate document exchange. After creation of the internet this format experienced significant growth and became de-facto standard for document exchange on the internet. One of the great advantages of PDF is that its rendering on the PC screen looks exactly the same way it would look on a paper if you print it.