Application role defines a specific data role assigned to the users who will then be assigned as an approver.
This option uses the Areas of Responsibility (AoR) assignment to find the appropriate approver. For example, a promotion transaction may require approval from HR Business Partner assigned to the worker.
This option requires that AoR assignment be defined in such a way that all workers have the appropriate representative assigned.
I hope this blog post was helpful for you. If you have any questions or feedback, please leave a comment below.