How do i removal adware from a mac

adware seems to have taken over my computer.  how do i remove it?  does apple have any tools to do this?  overtime i use safari to identify a problem, i get some non-apple sites trying to sell me something.

Click here and follow the instructions, or if there’s a type of adware not covered by them on the computer, these ones. If you're willing to use a tool to remove it(you don't need to, but may find it easier), you can instead run Adware Medic; this link is a direct download.
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