How does the regenerative braking system improve the efficiency of the Audi e-Tron?

I have heard that the Audi e-Tron has a regenerative braking system, but how exactly does it work and what benefits does it provide?

When you apply the brakes in an electric car like the Audi e-Tron, the energy that is usually lost as heat is instead captured and stored in the battery. This allows for a more efficient use of the vehicle's energy resources, resulting in longer range and reduced charging time.