Recovery Mode-Please give me more information about Mac OSX 10.8 Recovery mode.Thanks

By holding alt key recovery mode appear on the gray screen but i just want to know what kind of recovery is it? Am i going to loose my data after recovering?If not am i going to have fresh OS like factory settings again?Do i need to take a back up from all my datas or not? Am i going to loose other users account too?
Thanks in advance

You can boot into the Recovery partition and install a 'fresh' copy of OS X without destroyting the data on your hard drive. Only if you choose to do a complete new installation, erasing and formatting your hard drive, would you lose information.
It's best to have a backup scheme (or schemes) in place before reinstalling anything however. See - Most commonly used backup methods.
Good luck,
Clinton

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