How does the Audi A4's 48-volt mild hybrid system work?

I've heard that the Audi A4 has a 48-volt mild hybrid system. Can you explain how this system works and what its benefits are?

The 48-volt mild hybrid system in the Audi A4 uses a belt-driven alternator starter and a lithium-ion battery to provide power to the car's electrical components and assist the engine during acceleration.

One of the main benefits of the 48-volt mild hybrid system is improved fuel efficiency. It allows the car's engine to shut off more often during coasting and braking, saving fuel in the process.

Another advantage of this system is its ability to reduce emissions. By assisting the engine and allowing it to shut off more frequently, the 48-volt mild hybrid system helps reduce the amount of harmful pollutants released into the environment.