Firewalls

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Network firewalls are security appliances that monitor and control incoming and outgoing network traffic based on predefined security rules. Acting as a barrier between trusted internal networks and untrusted external networks (like the internet), firewalls help prevent unauthorized access, data breaches, and cyberattacks. They can be hardware-based, software-based, or integrated into other network devices. Firewalls inspect traffic using various techniques such as packet filtering, stateful inspection, and deep packet inspection, and may include features like intrusion prevention, VPN support, and application-level filtering. Their primary role is to enforce security policies and protect network resources from external and internal threats.