PDF means Portable Document Format
The PDF format was released by Adobe in 1993 and is a standard for exchanging electronic documents and forms that must be reproduced in their original state. A PDF file will look the same on every printer (layout, fonts, images, etc.). PDF is also platform independent, and is the most ideal format for distributing manuals and similar documents. Adobe software to read PDF files is free, but the software needed to convert PDF files is often not. However, there are many drivers that ensure that you can also print a file to a PDF file, which makes it possible to create free PDF files.
What is a PDF file [YouTube] pZiPWGgF8Nk [/youtube]