Windows Defender Overview
Microsoft Defender Antivirus is the security protection built directly into Windows 10 and 11, providing real-time defense against viruses, ransomware, and other malware at no extra cost and with no separate installation. It runs automatically as part of Windows Security, offering real-time scanning, cloud-delivered protection, ransomware safeguards (Controlled Folder Access), a firewall, and SmartScreen filtering of malicious downloads and sites. Because it is integrated into the operating system, it is lightweight and kept current through Windows Update. For most users it provides solid baseline protection without installing third-party antivirus. It also feeds Windows Security's broader features — account protection, device security, and family options — all from one dashboard. You can reach the official Windows Defender download from Microsoft Corporation via the link on this page.
