Why does the Audi A5 have a 48-volt mild hybrid system and how does it work?

I've heard that the Audi A5 has a 48-volt mild hybrid system, but I'm not sure what that means or how it works. Can you provide some information on this feature?

The 48-volt mild hybrid system in the Audi A5 is a technology that helps improve fuel efficiency and reduce emissions by assisting the engine during acceleration and deceleration. It works by using a small electric motor and a lithium-ion battery to provide additional power and support the engine.