Windows Security is a built-in feature of the Windows operating system designed to protect your computer from various threats. It includes tools like Windows Defender Antivirus, which scans for and removes malware, and a firewall that helps block unauthorized access to your system. Additionally, Windows Security offers features like Device Security to safeguard hardware components and Account Protection to manage user accounts and passwords. Regular updates ensure that the security measures stay current against new threats, helping users maintain a safer computing environment.