A Web Application Firewall (WAF) sits in front of your web application and reads the traffic going in and out. Attacks get filtered or blocked before they reach your code.
It works at the application layer, Layer 7 of the OSI model, which is why it catches the things a traditional firewall misses: SQL injection, cross-site scripting (XSS), file inclusion, cookie poisoning. The older firewall sees a request arrive. A WAF reads what is inside it, then applies the rules you set to every HTTP and HTTPS request between your users and your application.
That is how you prevent unauthorised access, data breaches and application-level vulnerabilities.
WAF solutions are critical for businesses that rely on online platforms and APIs, as they ensure the confidentiality and integrity of customer data and digital services. Whether deployed on-premises, in the cloud, or as a hybrid model, WAFs provide real-time threat mitigation, DDoS protection, bot management, and compliance support for standards like PCI DSS. With a WAF in place, organizations can confidently deliver digital services while minimizing the risk of exploitation and downtime.
A WAF is a security layer for your web applications. It inspects every HTTP/HTTPS request going in and out, and blocks the application-layer attacks a network firewall cannot see: SQL injection, XSS, credential stuffing, malicious bots. The application is what it protects, not the network around it.
