A firewall is a network security device that monitors incoming and outgoing network traffic and decides whether to allow or block specific traffic based on a defined set of security rules. It prevents hackers from attacking a network. Perhaps it is one of the best protections ever made to stand out against the internet threats. Including cyber attacks it prevents your computer from various other threats surrounding on the internet.

Firewalls have been a first line of defense in network security for over 25 years. They establish a barrier between secured and controlled internal networks that can be trusted and untrusted outside networks, such as the Internet.

A firewall can be hardware, software or both.

Benefits