Windows Firewall is enabled by default and should still be enabled unless you've disabled it manually or installed a ...

They permit or deny access to private network devices and applications, and represent an important part of an organization's overall security policy. Firewalls may be software applications, hardware ...

Instead of an open door to the world, your home network’s entrance is hidden and protected by firewalls. A firewall can protect you via hardware or software, and both are critically important.