Firewall - GCSE Computer Science Definition

A firewall is a security tool used in computer networks to help protect computers and data from hackers, viruses, and other malicious threats. It acts like a gatekeeper by monitoring and controlling the incoming and outgoing network traffic based on a set of security rules. Firewalls can be hardware devices or software programs, and they are essential because they help block harmful data while allowing safe data through. This way, a firewall keeps your computer or network safe from unwanted intrusions and ensures that only authorised access is granted. Understanding firewalls is important for students studying GCSE Computer Science, as it helps them learn how to secure and protect computer systems.