noun

firewall

/ˈfaɪərwɔːl/ · say it: FY·er·wawl

a system that blocks unauthorized network access

In Technology & Computing

In more detail

1. (noun) a wall or barrier designed to prevent fire from spreading from one area to another

2. (noun) a computer system or software that controls which data can enter or leave a network, used for security

Examples

1. The building has a firewall between the garage and the house.
2. You should install a firewall to protect your computer from unauthorized access.

How to use firewall

Firewall is used in two distinct contexts: construction/fire safety, where it refers to a physical barrier, and computing, where it refers to network security software or systems. In IT contexts, it is now the dominant meaning and is used as both a noun and increasingly as a verb (to firewall data). The term has become standard jargon in tech environments.

Common phrases

firewall software
install a firewall
configure the firewall
network firewall
firewall protection
firewall rules

Synonyms

barrier · partition · protection system · security system · access control

Word family

firewall (noun) · firewalling (verb)

A common mistake

Learners sometimes treat firewall as if it provides complete security; a firewall is one layer of security but does not prevent all threats.

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