What technology do Audi A8s use to reduce emissions?

I've been hearing a lot about electric and hybrid cars, but I'm interested to know what technology Audi A8s use to reduce their emissions. Can someone explain this to me?

Audi A8s use a combination of technologies known as Audi ultra, which includes direct injection, turbocharging and mild hybrid systems to reduce carbon dioxide emissions.

The Audi A8s use Audi's predictive efficiency assistant to optimize driving dynamics and fuel consumption. It's an advanced technology that helps reduce emissions without compromising performance.