I want to know if Azure front door be used for disaster management for a web app hosted in azure?
Reading the content around Azure front door, I understand that it can be used for following
Since it can be used for routing across multiple regions, I am not sure if having it in place is the solution for disaster recovery or some more steps need to be taken into account.
Yes and it is mostly used for creating high availability applications. You can deploy your web application in multiple other Azure regions for high availability. You can then use the Azure front door which can redirect traffic to the other if first region is unavailable.