According to Wikipedia, a Web Application Firewall (WAF) filters, monitors, and blocks HTTP traffic to and from a web application. Unlike a regular firewall, which serves as a security gate between servers, a WAF can filter the content of specific web applications. By inspecting HTTP traffic, it can prevent attacks that exploit web application vulnerabilities, such as SQL injection, cross-site scripting (XSS), file inclusion, and security misconfigurations.
A WAF has the following characteristics:
Comprehensive Detection of Web Code
In-depth Inspection of HTTP/HTTPS
Robust Signature Library
Network Layer Anti-tampering Mechanism
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