The area controller (also called en-route controller) is a person that provides air traffic control (ATC) service within an area control centre (ACC). They normally serve flights during the climb, cruise and initial descent phases.
The Area controller's job is dominated by the process of discovering and solving conflicts. By contrast, Approach and Tower controllers are mostly occupied by sequencing the traffic for taking off and landing. While it is common practice for an area controller to transfer several aircraft at the same at the same sector exit point (vertically separated), this is not an option for the tower and approach controllers when their "exit point" is the runway threshold.