What is Firewall?

A security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules.

Expanded Explanation

Firewalls act as a barrier between a trusted internal network and untrusted external networks, such as the internet. They can be hardware-based, software-based, or cloud-managed and are used to prevent unauthorized access while allowing legitimate communication. Modern firewalls also include features like deep packet inspection, intrusion prevention, and application-layer filtering.

Related Terms

Network Security, Intrusion Detection System, Packet Filtering, Perimeter Defense, Stateful Inspection

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