Web Application Firewall (WAF) Definition

Web Application Firewall (WAF) Definition

A Web application firewall (WAF) is a firewall that monitors, filters or blocks data packets as they travel to and from a Web application. A WAF can be either network-based, host-based or cloud-based and is often deployed through a proxy and placed in front of one or more Web applications. Running as a network appliance, server plug-in or cloud service, the WAF inspects each packet and uses a rule base to analyze Layer 7 web application logic and filter out potentially harmful traffic.

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