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Most apps can be removed by just trashing them, but some do leave some hidden files (e.g. demos, etc).
 

I know the question sounds silly but its actually legit if you figure he is coming from Windows.
With windows you have to do the whole "add/remove program" thing. When I first got my Mac I didnt think it was that easy as to just drag the program to the trash can or Command + delete.
 
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