View in HD at . Often people ask about the best anti-virus software, sometimes because they feel they need to have something installed, or they are required to do so by their company or school. But macOS already comes with anti-malware software, built-in as part of the operating system. There are three parts to this: Gatekeeper, XProtect and the Malware Removal Tool. Learn about them and find out how to make sure they are up-to-date.