The Short Version
Firewall is a network security device that monitors and filters incoming and outgoing network traffic based on an organization’s previously established security policies.
The Everyday Analogy
Think of it like a security guard standing at the front door checking who is allowed to enter.
Why it matters
Understanding this concept is crucial for protecting your digital identity and recognizing modern cyber threats before they cause damage.
Other Dictionary Terms
Access Control List (ACL)
A list of rules that specifies which users or systems are granted or denied access to a particular object or system resource.
Dictionary TermAdvanced Persistent Threat (APT)
A stealthy threat actor, typically a nation state or state-sponsored group, which gains unauthorized access to a computer network and remains undetected for an extended period.
Dictionary TermARP Spoofing
A type of attack in which a malicious actor sends falsified ARP (Address Resolution Protocol) messages over a local area network.