Microsoft Defender is a new security app that helps protect you and your family across all your devices; Windows, Android, Mac, and iOS.

It includes features such as Microsoft Defender Antivirus, Windows Firewall, and Smart App Control, which work together to provide real-time protection against viruses, malware, and …

Learn how to use virus and threat protection options in Windows Security to scan your device for threats and view the results.

If you're looking for information about the Microsoft Defender antivirus that is built into Microsoft Windows, see Stay protected with Windows Security. If you haven't installed Defender on your …

If you suspect that your device may have malware you should have Microsoft Defender run a scan. Here's how to do that on Windows, Mac, or Android.

Feb 4, 2021 · This package includes monthly updates and fixes to the Microsoft Defender antimalware platform and engine that is used by Microsoft Defender Antivirus in Windows 11.

Microsoft Defender SmartScreen helps protect you from dangerous websites, fake downloads, and phishing scams. It runs silently in the background, checking websites and files to help …

Find out how Windows Security can help keep your PC safe from malicious software and viruses.

Oct 14, 2025 · Follow these steps to automatically diagnose and repair Windows security problems by turning on UAC, DEP protection, Windows Firewall, and other Windows security …

Windows Security (Windows Defender Security Center in previous versions of Windows) enables you to scan specific files and folders to make sure they're safe. You'll be notified immediately if …