what is waf
Web application firewall (WAF) A Web application firewall (WAF) is a firewall that monitors, filters or blocks the HTTP traffic to and from a Web application. A WAF protects a Web application by controlling its input and output and the access to and from the application. Running as an appliance, server plug-in or cloud-based service, a WAF inspects every HTML, HTTPS, SOAP and XML-RPC data packet.