Yes, Windows Defender is free. It is included with Windows 10 and Windows 11 as part of the operating system, providing built-in antivirus protection without any additional cost.
Windows Defender and Windows Security are closely related but serve slightly different functions. Windows Defender is specifically the antivirus component that provides protection against malware, viruses, and other security threats. It includes features like real-time protection, behavior-based detection, and cloud-delivered protection.
On the other hand, Windows Security is the overarching application that provides a user interface for managing various security features, including Windows Defender, firewall settings, account protection, and more. Windows Security acts as a centralized hub for monitoring and configuring security settings on your device, while Windows Defender focuses primarily on antivirus capabilities.
In summary, Windows Defender is a component of Windows Security that specifically handles antivirus protection, whereas Windows Security encompasses a broader range of security features and settings.