Definition
A firewall enforces rules about which network traffic may enter or leave a system or network segment.
Why it matters for business
Network control that allows or blocks traffic based on policy. Security and IT decisions—and cyber insurance questionnaires—often assume leadership understands this term at a practical level.
Example in an SMB context
A growing firm in the CT/NY/NJ market might encounter Firewall when hardening Microsoft 365, selecting endpoint tools, or preparing an incident response plan.
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