Windows Security

What Windows Security is

Windows Security is a free security app built into Windows 10 and Windows 11. Microsoft Defender Antivirus provides real-time protection, threat monitoring, updates, and quick, full, custom, and offline scans. Threats can be quarantined and remediation can happen automatically, while users can review Defender actions. Windows Firewall filters traffic for domain, private, and public networks. Microsoft Defender SmartScreen evaluates websites and downloads against known malicious sites and files to help address phishing, malware, and potentially unwanted apps. Account protection links Windows Hello options and Dynamic lock, which locks a PC when you are away. Device Security covers core isolation, TPM, Secure Boot, and hardware security capability. The app also provides a device performance and health report. Smart App Control is unavailable in Windows 10 and works only on new Windows 11 installations.