An integrated threat protection solution designed to detect, investigate, and respond to cyber threats across Microsoft 365 services.
Hello
Microsoft 365 Personal, Family and Premium all include Defender. The only plan that doesn't is the Basic plan.
On a Windows 10 or 11 computer, the actual antivirus is Microsoft Defender Antivirus, found under Windows Security > Virus & threat protection. It is already built into Windows and works even without Microsoft 365.
The Microsoft Defender app included with Microsoft 365 Personal provides additional security monitoring and lets you view protection across your Windows, Mac, Android, and iOS devices.
To fully experience all features that come with, you can download the app onto your devices.