What is the significance of a PDF file extension?
The pdf tells you that you need Acrobat Reader software in order to be able to open and read the document on your computer because the document was formatted with Adobe Acrobat software. It may have originally been created in Word or WordPerfect or Excel or any of a number of other applications, but it has been further formatted with Adobe Acrobat (i.e., it has been converted to PDF). Adobe Acrobat helps to overcome incompatibilities between different types and versions of software programs, such as word processing software, because it provides a tool that converts documents into a universal format that can be read by anyone who has the free Acrobat Reader software.
