Why does the Audi R8 use a 'sideblade' design?

I've noticed that many newer models of the Audi R8 have a distinct 'sideblade' design on the side of the car. What is the purpose of this design and how does it contribute to the performance of the car?

The sideblade design of the Audi R8 serves both aesthetic and functional purposes. Aesthetically, it adds a sleek and sporty look to the car, distinguishing it from other models. Functionally, it helps with air flow and cooling of the engine, adding to the overall performance of the car.