These letters stand for portable document format and are used to indicate documents that can be printed from any computer and maintain all format features.
To see and print pdf documents requires the use of free software called Adobe Acrobat Reader which can be downloaded from the Adobe Web Site:
Two easy ways to create pdf documents:
1. Mac users with OS 10 can convert any document to pdf format with a "print" command option.
2. PC users can get a free plug-in to convert MS Word documents to pdf format from the CIB Web Site: