Is it possible to reset your mac completly without having an install disc

i want to erase/reset everything on my macbook. How do i do this?

If it has Mac OS X 10.6.8 or earlier installed, no.
If it has Mac OS X 10.7 or newer installed, click here and follow the instructions.
If you're doing this because you want to sell or give the computer away, the above applies to its original OS instead of the currently installed one.
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