The Windows Firewall, officially known as Windows Defender Firewall, is a built-in security feature included with modern versions of the Windows operating system.

It provides both inbound and outbound traffic filtering based on customizable rules, protecting devices from unauthorized access and common network threats.

By default, Windows Firewall operates with a balanced set of pre-configured rules, blocking unsolicited incoming traffic while allowing safe outbound communication.

Users and administrators can modify these rules through the graphical Windows Security interface or the more advanced Windows Firewall with Advanced Security console, which allows for granular control over port-based filtering, program exceptions, and connection security rules.

Managing Windows Firewall also involves using the command-line tool netsh or PowerShell, which provides scripting capabilities for bulk configuration and automation.

Windows Firewall supports profiles such as Domain, Private, and Public, allowing different rule sets depending on the network environment the device is connected to.

Organizations often leverage Group Policy to enforce standardized firewall configurations across multiple Windows devices, ensuring a consistent security posture.

Logs generated by Windows Firewall can also be reviewed to troubleshoot connectivity issues or identify suspicious activity within a Windows environment.

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