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.

Learn what a firewall is, why it is important, how it works, and firewall best practices. Learn how a firewall can ensure the data is harmless and prevent data from being stolen or compromised.

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 …

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 …

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

May 13, 2025 · The firewall: How it protects computers, network devices & more A firewall is a security system that acts like a digital barrier between connected devices and the outside world (the internet). …

A firewall is the digital gatekeeper of your network, controlling traffic, preventing unauthorized access, and protecting sensitive data.

By definition, a firewall is a network security system to monitor traffic to or from your network. It establishes a barrier that allows or blocks web traffic.

Firewalls protect against unauthorized access, malicious software, and cyberattacks. They prevent harmful entities like hackers, viruses, and worms from infiltrating or exfiltrating sensitive data.

At its most basic, a firewall either permits or blocks a requested network connection—such as a website, an e-mail, or a file transfer —based on a set of policies determined by a network administrator or …