Why It Matters
A firewall is one of the most fundamental layers of security for any business that operates online, which today means virtually every business. Without a firewall, your servers and network are exposed to the entire internet, making them easy targets for automated attacks, port scanning, and unauthorised access attempts. Firewalls help prevent data breaches, block malware from reaching your systems, and limit the damage if one part of your network is compromised. They are not a complete solution on their own, but they are an essential first layer of defence that works alongside other measures like HTTPS, authentication, and regular patching. Addressing known vulnerabilities promptly is what gives that layered approach its strength. Browse the glossary for related security definitions.
Example
Your company hosts its website and customer portal on a cloud server. A web application firewall (WAF) sits in front of both. When a legitimate customer visits the portal, their traffic passes through normally. When an automated bot tries to exploit a known vulnerability by sending thousands of malicious requests, the firewall recognises the attack pattern and blocks the traffic before it ever reaches your application. Your customers experience no disruption, and your server stays secure.
