Feel like you need a clean slate? Whenever you want to, you can restore the factory settings on your Mac. This means erasing all your data, everything you’ve done on the computer, and reverting it back to just like it was when you took it out of the box
Here is the simple process to do it quickly.
Why would I want to do this?
Ordinarily, losing absolutely everything unique on your Mac would be cause for concern and possibly thrown keyboards. But there are scenarios where a full wipe and restore session can prove valuable. The most common is when you want to sell your computer as a used device through someplace like eBay or Craigslist. No buyer is going to want a computer with a hard drive full of someone else’s data, so resellers typically work to reset the computer.