Just what is PDF format, how do I view it, and why do people use it?

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About editing PDF. PDF is just like a printed piece of paper not intended to be edited. However writing on it is possible.
For example the PDF-xchange viewer has a typing tool. If you want some thing gone you can use it to draw a filed rectangle across it.

"assuming that everyone has Microsoft Word or PowerPoint. Not only are they not free"

Microsoft offers free Office Word/Excel/PowerPoint readers downloadable from their web site. You can not modify or create files, but you can read what others have sent you.

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