Just a few advantages of pdf:
- widely used
- not so easy to change (read: falsify) like... say a .doc
and maybe the most important point:
- it can be used under different OSs
(Which is of course due to the aformentioned fact that you have to download a reader...)
Now, I'm not saying that pdf is the best there is, just trying to answer the initial question:
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Can someone please tell me why this format is used at all?
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