Windows Defender Security Center is a built-in security feature in Windows 10 and 11 that includes an antivirus program called Microsoft Defender Antivirus. It provides real-time protection against malware, viruses, and security threats, and updates are downloaded automatically to help keep your device safe and protect it from threats. Windows Security is the client interface for Windows Defender Security Center on Windows 10, version 1703 and later. It includes features such as App & browser control, Device security, and Account protection. Windows Security cannot be uninstalled, but it can be disabled by disabling the Windows Security Center Service. However, disabling this service wont disable Microsoft Defender Antivirus or Windows Defender Firewall. It is important to note that there are phishing scams that use the name "Windows Defender Security Center" to trick users into infecting their devices or stealing personal information.