Why is the 2021 Audi A8 equipped with a mild-hybrid system?

I'm interested in buying the 2021 Audi A8, and I noticed that it comes with a mild-hybrid system. Can you explain the purpose and benefits of this technology?

The mild-hybrid system in the 2021 Audi A8 provides additional power and improved fuel efficiency. It uses a small electric motor to assist the engine when accelerating, reducing the strain on the engine and saving fuel.

The mild-hybrid system also allows for smoother start-stop functionality, automatically shutting off the engine when the car is stopped and seamlessly restarting it when you release the brake. This not only saves fuel, but also reduces emissions.

Additionally, the mild-hybrid system in the 2021 Audi A8 uses regenerative braking to capture energy that would normally be lost and store it in the battery. This energy can then be used to power the car's electrical systems, reducing the load on the engine and again, improving fuel efficiency.