In terms of the overarching goal of the new aerodynamic regulations, the new front wing and new underfloor outlined in the previous two Tech Tuesdays prepare the airflow in a way that the new rear wing can complete the process: launching the turbulent wake of the car to the top. in the air and away from the front wing of the following car. It also works like a conventional rear wing to create downforce.
Although not as much downforce as previous rear wings were created. It carries two items, as before, albeit with tighter controls on the shape of the items and the amount by which they are allowed to overlap.