Firewall
A network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. Firewalls can be hardware-based, software-based, or cloud-based and serve as a barrier between trusted and untrusted networks.
Extended Explanation
Firewalls have evolved from simple packet filters to next-generation firewalls (NGFWs) that include deep packet inspection, application awareness, intrusion prevention, and threat intelligence integration. Modern firewalls can identify and control applications regardless of port or protocol.
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