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Firewall vs Antivirus: what is the difference?
In short: A firewall acts like a guard at the door, allowing or blocking network connections by rules. Antivirus (today often EDR) works inside the device, detecting and removing malicious files and behaviour. They protect against different things and work best together.
Firewall vs Antivirus in one sentence
A firewall decides which network traffic may come in or go out, while antivirus looks for and removes malicious software on the device itself.
Side-by-side comparison
| Feature | Firewall | Antivirus |
|---|---|---|
| Protects | The network connection | The files and programs on a device |
| Works by | Rules on addresses, ports and apps | Signatures and behaviour analysis |
| Stops | Unwanted connections, port scans, some exploits | Viruses, trojans, ransomware, spyware |
| Where | Network edge or on each device | On each device |
| Examples | Router firewall, NGFW, Windows Defender Firewall | Microsoft Defender Antivirus, EDR products |
| Cannot stop | Malware you download over an allowed connection | Network attacks that never touch a file |
What is Firewall?
A firewall filters traffic. At home it blocks unsolicited connections from the internet; in a business it separates zones such as staff, guests and servers. Next-generation firewalls also inspect applications and block known threats.
What is Antivirus?
Antivirus scans files and watches behaviour on a computer or phone. Modern products, called endpoint detection and response (EDR), also record activity so security teams can investigate and isolate an infected device.
Which one should you use?
You need both. Keep the firewall switched on (on Windows and macOS it is built in) and use the built-in antivirus or a reputable product. Add updates, backups and MFA: no single tool stops everything.
Common mistakes and myths
- "I have a firewall, so I do not need antivirus." A phishing download passes straight through an allowed web connection.
- Running two real-time antivirus products together; they can conflict.
- Turning the firewall off to "fix" an app instead of adding a proper rule.
Learn more
Key takeaways
- Firewalls filter traffic; antivirus removes malware.
- They stop different threats.
- Use both, plus updates, backups and MFA.
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