COMPUTER FUNDAMENTALS

Detailed explanation-1: -A firewall is a network security system that tracks traffic on your computer and identifies any potential malicious activity. Once identified, many firewalls will attempt to block or restrict the malicious traffic from accessing your data. Firewalls can be both hardware and software, but the latter is much more common.

Detailed explanation-2: -A firewall is a security system designed to prevent unauthorized access into or out of a computer network. Firewalls are often used to make sure internet users without access are not able to interface with private networks, or intranets, connected to the internet.