Firewall technology is a form of network security that allows administrators to control incoming and outgoing network traffic. Firewalls work by controlling the flow of data between networks and systems, allowing only authorized traffic to pass through. Firewalls can be configured to block certain types of traffic, such as malicious code and viruses, while allowing other types of traffic, such as web traffic and email, to pass through. Firewalls can also be used to monitor and log traffic, allowing administrators to identify and investigate suspicious activity.