Why does the 2021 Audi A5 have a 48-volt mild hybrid system?

Can someone explain the purpose and benefits of having a 48-volt mild hybrid system in the 2021 Audi A5?

The 48-volt mild hybrid system in the 2021 Audi A5 is designed to improve fuel efficiency and reduce emissions. By using a small electric motor to assist the engine, the car is able to use less fuel without sacrificing performance.

Having a 48-volt mild hybrid system also allows for smoother start-stop technology and enhanced regenerative braking, helping to reduce wear and tear on the brakes and improve overall driving experience.