Learn how BitLocker, passkeys, Microsoft Defender, and other Windows 11 security features protect your data, accounts, apps, and devices.

For most people using a supported and fully updated Windows 11 computer, yes: Microsoft Defender Antivirus and the other protections inside Windows Security are sufficient as the primary antivirus.

Microsoft says a new Defender capability isolated a compromised device and stopped a ransomware attack in 128 seconds.

A patch Microsoft released on Wednesday to fix a zero-day vulnerability in its Defender security engine may cause Windows machines to write files large enough to completely consume available disk ...

Do you still need third-party antivirus on your Windows PC?

Suchi Rudra is a writer whose work has appeared in The New York Times, BBC and Vice, among other publications. Schools faced more ransomware attacks than hospitals or governments faced in 2023, ...

Microsoft is named a Leader in the 2026 IDC MarketScape for MDR services. Discover how Microsoft Defender Experts MDR combines AI, threat intelligence, and human expertise.

Microsoft is notifying users that it will no longer support the Privacy Protection VPN feature within the Microsoft Defender app. The feature will be removed on Feb ...