What is the primary function of Windows Defender Firewall?

The primary function of Windows Defender Firewall is to protect the computer from unauthorized access and potentially malicious software over the network. It does this by monitoring and controlling incoming and outgoing network traffic based on predetermined security rules. This helps safeguard the system against various threats from the internet and other networks, restricting access to data and devices connected to those networks.

While managing user accounts, optimizing system performance, and configuring network settings are important aspects of operating system functionality, they do not specifically relate to the core role of the Windows Defender Firewall. Its main focus is on maintaining security by acting as a barrier between trusted and untrusted networks, ensuring that harmful data is blocked and that the system remains safe from potential attacks.