What is brake energy regeneration and how does it work on the Audi A2?

I've heard that the Audi A2 has brake energy regeneration, but I don't really understand what that means or how it works. Can someone explain it to me?

Brake energy regeneration is a feature that helps the Audi A2 to conserve energy and improve fuel efficiency. Essentially, it uses the energy generated when you brake to recharge the car's battery.

Think of it like a hybrid car: when you brake, the car captures and stores the energy that would normally be lost as heat