[Crawl-Date: 2026-04-19]
[Source: DataJelly Visibility Layer]
[URL: https://griffinitgroup.com/it-glossary/firewall]
---
title: What Is a Firewall?
description: A network security device that monitors and filters incoming and outgoing network traffic based on security rules. Firewalls establish a barrier between t...
url: https://griffinitgroup.com/it-glossary/firewall
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og_title: What Is a Firewall?
og_description: A network security device that monitors and filters incoming and outgoing network traffic based on security rules. Firewalls establish a barrier between t...
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# What Is a Firewall?
> A network security device that monitors and filters incoming and outgoing network traffic based on security rules. Firewalls establish a barrier between t...

---

Security

Beginner
## What Is a Firewall?
What Is a Firewall? Firewall a network security device that monitors and filters incoming and outgoing network traffic based on security rules. Firewalls establish a barrier between trusted internal networks and untrusted external networks.

## Why This Matters for Your Business
A properly configured firewall is your network's first line of defence, controlling what traffic enters and exits your business systems. Misconfigured or outdated firewalls are one of the most common entry points for cyberattacks on small businesses.

## Related Security Terms

[Beginner
## 2FA (Two-Factor Authentication)
A security process that requires users to provide two different authentication factors to verify their identity. This typically combines something you know (password) with something you have (phone) or something you are (fingerprint).](https://griffinitgroup.com/it-glossary/2fa) [Intermediate
## DLP (Data Loss Prevention)
A strategy and set of tools to prevent sensitive data from being lost, misused, or accessed by unauthorized users. DLP software detects potential data breaches and prevents them by monitoring, detecting, and blocking sensitive data.](https://griffinitgroup.com/it-glossary/dlp) [Intermediate
## EDR (Endpoint Detection and Response)
A cybersecurity solution that continuously monitors and responds to potential threats on endpoints like computers and servers. EDR tools detect, investigate, and respond to suspicious activities in real-time.](https://griffinitgroup.com/it-glossary/edr) [Intermediate
## Encryption
The process of converting data into a coded format that can only be read by someone with the correct decryption key. Encryption protects sensitive information from unauthorized access.](https://griffinitgroup.com/it-glossary/encryption)

[Field Services (IT)Previous](https://griffinitgroup.com/it-glossary/field-services) [All Terms](https://griffinitgroup.com/it-glossary) [Governance FrameworkNext](https://griffinitgroup.com/it-glossary/governance-framework)

## Need Help With Security?

Our team can help you understand and implement the right technology solutions for your business. Get expert guidance from local IT professionals.

[Schedule a Consultation](https://griffinitgroup.com/contact) [Call (289) 667-4000](tel:+12896674000)

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