Final answer:
Azure Application Gateway is a web traffic load balancer that helps manage traffic to web applications, distinct from an Availability Set or a Scale Set, which have other functionalities.
Step-by-step explanation:
Azure Application Gateway is a web traffic load balancer that enables you to manage traffic to your web applications. It stands apart from the options given like an Availability Set and a Scale Set, which serve different purposes. An Availability Set is a logical grouping used to isolate VM resources from each other when they’re deployed, ensuring that if one VM fails, the others remain unaffected. On the other hand, a Scale Set is a service that supports high availability and elastic scale-out and scale-in for your applications.
It acts as an intelligent application delivery controller, distributing incoming traffic across multiple backend servers efficiently.
This ensures high availability, improved performance, and scalability for web applications.