What is a Firewall, and how does it work? A firewall helps defend your network from attackers, which is the answer to what is a firewall. A firewall protects your network by acting as a 24/7 filter, examining every data that seeks to enter your network and blocking anything that appears to be malicious. (Fortinet Network Firewall) To understand how a firewall works, imagine it as a security guard who knows everything there is to know about millions of prospective offenders. If the guard notices one, he or she will keep the criminal out. Similarly, a firewall’s protection…