Why does the Audi A5 use a 48-volt mild-hybrid system?

I've noticed that the Audi A5 comes with a 48-volt mild-hybrid system. What is the purpose of this system and how does it benefit the overall performance of the vehicle?

The 48-volt mild-hybrid system helps reduce fuel consumption and emissions by allowing the vehicle to coast with the engine off at speeds between 55 to 160 km/h. It also provides a boost of up to 12 kW when accelerating, improving overall performance. Overall, this system helps create a more efficient and dynamic driving experience.

The 48-volt mild-hybrid system in the Audi A5 allows for smoother engine start-stop functionality and regenerative braking, improving fuel efficiency. It also provides electric power during acceleration, improving performance and response time. In essence, this system helps create a more sustainable and responsive driving experience.