Why does the Audi A8 use a dual-clutch transmission instead of a traditional automatic transmission?

I've noticed that the Audi A8 utilizes a dual-clutch transmission, but most luxury cars typically use a traditional automatic transmission. What are the benefits of using a dual-clutch system and why did Audi choose to use it in the A8?

The Audi A8 uses a dual-clutch transmission because it offers faster and smoother gear shifts compared to a traditional automatic. It also allows for better fuel efficiency. Manufacturers like Audi have been using dual-clutch transmissions in their performance vehicles for years, and now it is becoming more common in luxury cars as well.