Ask someone what antivirus software they use and you’ll probably get a near-religious argument about which one they have installed. Antivirus choices are often about what we trust — or don’t — on our operating system. I’ve seen some Windows users indicate they would rather have a third-party vendor watch over and protect their systems. Others, like me, view antivirus software as less important these days; it matters more that your antivirus vendor can handle windows updating properly and won’t cause issues.
Still others rely on Microsoft Defender. It's been around in one form or another since Windows XP.