+A **firewall** is a [network](/wiki/network) [security](/wiki/security) system that monitors and controls incoming and outgoing network traffic. It forms a digital barrier, filtering data based on a set of defined rules to prevent unauthorized access and block threats.
+## See also
+- [Cybersecurity](/wiki/cybersecurity)
+- [VPN](/wiki/vpn)
+- [Router](/wiki/router)
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