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Firewall - Meaning, Definition & English Examples

A firewall is a security system that monitors and controls incoming and outgoing network traffic. It acts as a barrier to protect a computer or network from unauthorized access or cyber threats.

firewall

/ˈfaɪərˌwɔl/ /ˈfaɪəwɔːl/

Definition:

A security system controlling network traffic to block unauthorized access while allowing approved communication.

Synonyms:

barrier, shield, safeguard, filter

Part of Speech:

noun

Antonyms:

vulnerability, openness

Common Collocations:

configure a firewall, bypass the firewall, firewall protection, firewall software

Derivatives:

firewalled, firewalling

Usage Tips:

Use "firewall" to refer to digital or metaphorical barriers preventing unwanted access or threats.

Common Phrases:

behind the firewall, firewall rules, hit a firewall

Etymology:

Originated in the 1980s from "fire" (destructive force) + "wall" (barrier), describing network security systems.

Examples:

  • 1. The company installed a strong firewall to protect its data.
  • 2. Her computer crashed because the firewall blocked a critical update.
  • 3. You should never disable your firewall while browsing the internet.
  • 4. The IT team updated the firewall rules yesterday.

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