What is firewall: A firewall isa network security device

A firewall isa network security device that monitors and controls network traffic based on predefined rules.Learn about the different types of firewalls, their functions, and how they protect against external and insider threats. Jul 21, 2025 ·Afirewallis a network security device that monitors and filters network traffic based on an organization’s security policies. Firewallsprotect networks by monitoring and controlling traffic based on defined rules. Learn what afirewallis, how it works, and explore key types. Afirewallis your network’s first line of defense against the cybersecurity threats of the public internet. Whether hardware or software,firewallsare designed to restrict access to your organization’s sensitive data while helping you monitor your network for suspicious activity. Think offirewallsas the gatekeepers to the public internet for your network users, filtering out threats ...