How does the Audi e-Tron achieve regenerative braking?

I'm curious about the technology behind regenerative braking in electric cars, specifically the Audi e-Tron. Can you explain how it works and how efficient it is?

The Audi e-Tron uses a combination of its electric motors and braking system to achieve regenerative braking. When the driver releases the accelerator pedal, the motors act as generators and convert the kinetic energy of the car into electricity, which is then stored in the battery. This allows the car to slow down without using the traditional brakes, reducing wear and tear and increasing energy efficiency.