Microsoft asserts that Microsoft Defender is sufficient for most Windows 11 users, negating the need for additional antivirus software. Windows 11 is described as "the most secure Windows yet," with Defender providing adequate protection against everyday risks, provided users maintain default settings and keep their systems updated. However, power users, particularly those managing multiple devices or requiring advanced features, may benefit from third-party antivirus solutions. Installing additional antivirus software can lead to increased system resource usage and potential conflicts with Defender, so it is recommended to use only one real-time antivirus solution for optimal performance.