Resource Owner:
The owner of the resource can control who is allowed to Direct Book the resource, who is a resource delegate, and certain time constraints for the resource. See How to Manage an Exchange Resource.
Resource Delegate:
Delegates are responsible for managing Exchange Resources. Any meeting requests that are sent to Exchange Resources without the use of Direct Booking will be sent on to all of the delegates. They can then choose to accept or reject the appointment on behalf of the resource.
Direct Booking:
Direct Booking allows users to directly schedule a resource without any intervention.