The PDF file format is quickly becoming the de-facto format for sharing information on the web.
The good thing about PDF files is that the format allows the creator of the document, the ability to retain the original formatting even when the document is being viewed on different operating systems or different viewers.
The only problem with PDF files, though, is that it’s not easy to edit them. Not unless you buy the Adobe Acrobat suite which costs a bit of money, well … a lot of money !