Why does the Audi A7 have a mild hybrid powertrain?

I've noticed that the Audi A7 uses a mild hybrid powertrain, but I'm unsure of the benefits or why this technology is used. Can you explain the reasoning behind it?

The mild hybrid powertrain in the Audi A7 utilizes a 48-volt battery system, which allows for a smoother and more efficient start-stop system. It also offers a boost in power when accelerating from a stop, resulting in improved performance and fuel economy.

Audi implements a mild hybrid powertrain in the A7 to reduce emissions and improve overall fuel efficiency. This technology also allows for the use of a smaller engine without sacrificing performance.