Azure Front Door works very similarly to Application Gateway but on a different level. Like Application Gateway, it's an L-7 load balancer with an SSL offload. The difference is that Application Gateway works with services in a single region, whereas Azure Front Door allows us to define, manage, and monitor routing on a global level. With Azure Front Door, we can ensure the highest availability using global distribution. A similar thing can be achieved with Azure Traffic Manager (in terms of global distribution), but this service lacks L-7 load balancing and SSL offloading.
What Azure Front Door provides actually combines Application Gateway and Traffic Manager to enable an L-7 load balancer with global distribution. It's also important to mention that a WAF is also available on Azure Front Door. Using a WAF on Azure Front Door, we can provide web application protection for globally distributed applications.
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