Account Protection in the Windows Security App — by Microsoft Support

Device Encryption applies BitLocker protection on more devices than full BitLocker, including Windows Home. It turns on by default with a Microsoft or work/school account, while local accounts must enable it manually.

Describes potentially unwanted apps that sit between safe software and malware, such as ad-heavy programs, and how to reduce the risk and remove them.

A plain-language tour of Windows 11's built-in defences against phishing, password theft, malware and scams, including Defender Antivirus, passwordless sign-in, SmartScreen and Smart App Control.