Azure Application Gateway

        Application Gateway is web traffic load balancer ( based on layer 7)

Redirection: It helps you to redirect and manage the requests coming in to your application

Session affinity: It will send the consequent requests to the previously used resource

Web application firewall (WAF): Helps you to detect and prevent attacks to your app

Web Application Firewall: it’s a web application firewall, it will prevent or detect the various threats coming to your website. There are also predefined guidelines from Microsoft, where you can enable the rule sets OR set your custom rule set. For e.g. you want to detect from a particular source and you want to block that particular region you can simply detect that and prevent or redirect to a different page.

Here are some features of an Application Firewall:

1. Application Gateway is a type of firewall that provides application-level control over network traffic. Application gateways can be used to deny access to the resources of private networks to untrusted users over the Internet.
2. It is a web traffic load balancer that enables you to manage traffic to your web applications.
3. It can make routing decisions based on additional attributes of an HTTP request, for example URL path or host headers. For example, you can route traffic based on the incoming URL. So if /images is in the incoming URL, you can route traffic to a specific set of servers (known as a pool) configured for images. If /video is in the URL, that traffic is routed to another pool that's optimized for videos.

Here is a quick comparison between different load-balancing solutions available on Azure like Azure Load balancer, Application Gateway, Traffic manager and Azure Front Door.