Begginer asks: How to format the disk?

Hi everyone
I am about to upgrade my lion os x to mountain lion tomorrow.
I'm new to mac and I used to work with windows so much
in windows before when I want upgrade my windows or install one on a system first I format it in order to clean up all of the hard disk and start a new windows with a completely clean disk.
now I want to clean up whole of my disk and applications before starting the mountain lion
is there anyway to do that?
remember: I'm a begginer on mac system

There is no need to reformat your hard drive. Just run the ML installer. This is not a Windows PC. That said of course you will have at least one backup incase there is an issue.
No I want to clear everything before installing myself
I want to preform a clear installation

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