How to Erase everything from my Mac

I have a MacBook Air running version 10.9 and i want to get rid of all my files, i dont have anything important on it that i want to keep. I've read that you need a disc of some kind, but i dont have one or anything. so what should i do?
I am wanting to sell my mac thats why i need to erase the stuff

There's an "invisible" recovery disk partition (which is where the Command + "R" boots from) that leaves enough of the Operating System behind for you to boot from. This area does not get erased.

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How to Erase everything from my Mac

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