Update operating-system.md

windows/security/operating-system.md

@@ -1,17 +1,44 @@
 ---
 title: Windows operating system security
-description: 
+description: Securing the operating system includes system security, encryption, network security, and threat protection.
 ms.reviewer: 
 manager: dansimp
-ms.author: dansimp
+ms.author: deniseb
 ms.prod: w10
 ms.mktglfcycl: deploy
 ms.sitesec: library
 ms.pagetype: security
-author: dansimp
+author: denisebmsft
 ---
 
 # Windows operating system security
 
 Security and privacy depend on an operating system that guards your system and information from the moment it starts up, providing fundamental chip-to-cloud protection. Windows 11 is the most secure Windows yet with extensive security measures designed to help keep you safe. These measures include built-in advanced encryption and data protection, robust network and system security, and intelligent safeguards against ever-evolving threats. 
 
+The operating system security features in Windows 11 include:
+
+- System security
+    - Trusted Boot (includes Secure Boot and Measured Boot)
+    - Cryptography and certificate management
+    - Windows Security app
+- Encryption and data protection
+    - BitLocker
+    - Encryption
+- Network security
+    - Virtual Private Networks (VPNs)
+    - Windows Defender Firewall
+    - Bluetooth
+    - DSN security
+    - Windows Wi-Fi
+    - Transport Layer Security (TLS)
+- Protection from viruses and threats
+    - Microsoft Defender Antivirus
+    - Attack surface reduction
+    - Tamper protection
+    - Network protection
+    - Controlled folder access
+    - Exploit protection
+    - Microsoft Defender for Endpoint
+
+
+