Firewall Definition: What Is A Network Firewall? A firewall is a network security device designed to monitor, filter, and control incoming and outgoing network traffic based on predetermined security rules.

Firewall (computing) In computing, a firewall is a network security system that monitors and controls incoming and outgoing network traffic based on configurable security rules. [1][2] A firewall typically …

A firewall is a network security device that monitors traffic to or from your network. It allows or blocks traffic based on a defined set of security rules.

Firewalls protect networks by monitoring and controlling traffic based on defined rules. Learn what a firewall is, how it works, and explore key types.

Dec 12, 2025 · A firewall is a network security system, available as hardware or software, that monitors and controls incoming and outgoing traffic based on predefined rules. It acts like a security guard, …

Firewall – meaning and definition A firewall is a computer network security system that restricts internet traffic in to, out of, or within a private network.

A firewall is a network security solution that monitors and regulates traffic based on defined security rules and accepts, rejects or drops traffic accordingly.

May 19, 2025 · What is a firewall and why do I need one? A firewall is a network security device that prevents unauthorized access to a network by inspecting incoming and outgoing traffic using a set of …

Nov 1, 2025 · Firewall, type of system used to monitor connections between computer networks. One of the earliest responses to malicious activity perpetrated through the Internet, firewalls became a …

A firewall is a network security device – either hardware or software-based – that monitors and controls incoming and outgoing network traffic based on predetermined security rules.