Best malware software for MacBook air

If you're trying to prevent malware from getting onto the computer, none; instead, avoid downloading software from sources other than the Mac App Store or the developer websites.

If you're trying to remove it, click here and run the tool.

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it might also be worth your time to read this informative user tip: Effective defenses against malware and other threats - Apple Community. it's a long article, but worth your time to read every word.