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windows/security/book/operating-system-security-encryption-and-data-protection.md

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 # Encryption and data protection
 
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 When people travel with their PCs, their confidential information travels with them. Wherever confidential data is stored, it must be protected against unauthorized access, whether through physical device theft or from malicious applications.
 
 ## BitLocker

windows/security/book/operating-system-security-network-security.md

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 # Network security
 
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 Windows 11 raises the bar for network security, offering comprehensive protection to help people work with confidence from almost anywhere. To help reduce an organization's attack
 surface, network protection in Windows prevents people from accessing dangerous IP addresses and domains that may host phishing scams, exploits, and other malicious content.
 Using reputation-based services, network protection blocks access to potentially harmful, low-reputation domains and IP addresses.

windows/security/book/operating-system-security-system-security.md

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 # System security
 
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 ## Trusted Boot (Secure Boot + Measured Boot)
 
 Windows 11 requires all PCs to use Unified Extensible Firmware Interface (UEFI)'s Secure Boot feature. When a Windows 11 device starts, Secure Boot and Trusted Boot work together to prevent malware and corrupted components from loading. Secure Boot provides initial protection, then Trusted Boot picks up the process.

windows/security/book/operating-system-security-virus-and-threat-protection.md

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 # Virus and threat protection
 
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 Today's threat landscape is more complex than ever. This new world requires a new approach vto threat prevention, detection, and response. Microsoft Defender Antivirus, along with many other features that are built into Windows 11, is at the frontlines, protecting customers against current and emerging threats.
 
 ## Microsoft Defender SmartScreen