What is the function of Windows Firewall?

The function of Windows Firewall is to provide network security by controlling incoming and outgoing traffic. This is accomplished through a set of predefined rules and policies that determine which network connections are permitted or blocked based on factors such as the source and destination addresses, port numbers, and the type of traffic.

By analyzing the data passing through the network interface, Windows Firewall protects the operating system from unauthorized access and potential threats, such as malware or brute-force attacks. It can also be configured to create custom rules for specific applications or services, enhancing the security posture of the system.

This functionality is critical for maintaining a secure environment, especially in scenarios where devices connect to public or untrusted networks. While other aspects may enhance the overall performance or user experience, controlling traffic is central to protecting data and systems from external threats.