How does the Audi A2's energy recovery system work?

I've heard that the Audi A2 has an energy recovery system, but how does it actually work and what are the benefits?

The Audi A2's energy recovery system uses regenerative braking to capture and store energy that is normally lost during braking. This energy is then used to power the car's electronics, reducing the strain on the engine and improving fuel efficiency.

By recovering energy that would otherwise be wasted, the Audi A2's energy recovery system allows for a more sustainable and efficient driving experience. Not only does it save gas, but it also reduces CO2 emissions.