Windows 11 accounts for nearly 44% of global desktop users as of April 2025, making it a prime target for cybercriminals, with 83% of malware in 2020 aimed at Windows systems. Microsoft Defender, which comes pre-installed with Windows 11, offers commendable malware protection, basic ransomware protection, a SmartScreen feature for anti-phishing, and a firewall that monitors network traffic. While it provides a solid foundation for security, additional third-party antivirus software can enhance protection, offering more comprehensive features such as superior parental controls, integrated VPN services, and identity theft protection.