A firewall is a network security system that monitors and controls the incoming and outgoing network traffic based on predetermined security rules. Firewalls are commonly used to protect computers and networks from unauthorized access or attacks.

There are a variety of firewall technologies that can be used, including hardware firewalls, software firewalls, and stateful inspection firewalls. Hardware firewalls are physical devices that are installed in-line with the network traffic, while software firewalls are applications that are installed on the computers that are being protected. Stateful inspection firewalls are a type of software firewall that use a special algorithm to examine …