Explanation
Graphical user interface, text, application Description automatically generated

Box 1: Azure Application Gateway
Azure Application Gateway provides an application delivery controller (ADC) as a service. It offers various layer 7 load-balancing capabilities for your applications.
Box 2: Web Application Firwewall (WAF)
Application Gateway web application firewall (WAF) protects web applications from common vulnerabilities and exploits.
This is done through rules that are defined based on the OWASP core rule sets 3.0 or 2.2.9.
There are rules that detects SQL injection attacks.
References:
https://docs.microsoft.com/en-us/azure/application-gateway/application-gateway-faq
https://docs.microsoft.com/en-us/azure/application-gateway/waf-overview