What is the E-Tron System in the Audi R8 and How Does it Work?

I've heard about the E-Tron System in the Audi R8, but I'm not sure what it actually does. Can someone explain its purpose and how it operates?

The E-Tron System in the Audi R8 is a hybrid powertrain that combines a traditional gas engine with an electric motor and battery pack. This allows for better performance and efficiency. The electric motor can provide a boost of power to the gas engine and also allows for all-electric driving for short distances. It works by using regenerative braking to recharge the battery when the car is decelerating or braking.