Microsoft · since 2006
Microsoft Defender Antivirus
The free antivirus already on your PC — and good enough to keep.
Microsoft Defender is already protecting your Windows PC. It updates automatically, stays out of the way, and is strong enough for everyday browsing, email, and downloads.
Paid suites mostly sell extras and reassurance. For most home users the winning move is simple: leave Defender on, keep Windows updated, and skip the second antivirus install.
Why it's here
- Built into Windows — no extra install or subscription
- Quiet, automatic protection that stays out of your way
- Good enough for normal home and work use without a paid suite