A security policy connects a web application firewall policy to an Azure Front Door profile. The association applies WAF protection to selected Front Door domains and path patterns. section 3.3.2
WAF association
A policy named contososecurity associates the AzFrontDoorWafPolicy WAF policy with the contosofrontend endpoint in the myWAFAzD profile. The WAF can operate in detection or prevention mode; prevention blocks matching requests, so tuning helps avoid blocking legitimate traffic. section 3.3.2
