The clients are passed through the WAF before reaching the server in order to protect the server from exposure.

The advantage of WAF is that it functions independently from the application, but yet it can constantly adapt to the application behavior changes.

When a WAF is deployed in front of a web application, a shield is created between the web application and the Internet.

According to the OSI model, WAF is a protocol layer seven defense.

This shield protects the web application from different types of attacks. In simple words, a Web Application Firewall acts as a shield between a web application and the Internet. Web Application Firewall protects the web application by filtering, monitoring, and blocking any malicious HTTP/S traffic that might penetrate the web application.

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Waf web application firewall