A Web Application Firewall (WAF) is a security barrier that monitors, filters, and blocks HTTP traffic traveling to a web application from the Internet, and vice versa. It protects web applications from attacks such as cross-site scripting (XSS), SQL injection, and other application-layer attacks by examining the HTTP traffic and applying rules to filter out malicious requests. WAFs are commonly deployed in front of web applications to provide an additional layer of security.
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