How to do a clean instal

I note in a lot of replies to posts, the suggestion is made to do a clean instal.
What does that mean and how does one do it?
DO you have to send files to trash first, use and uninstal process or just reinstal the software?
Cheers

Clean install procedure
http://discussions.apple.com/thread.jspa?messageID=9979643&#9979643

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    Hope this will help someone.
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