What are the key differences between the Audi A8 and A6 models?

I am interested in purchasing a new luxury car and am considering both the Audi A8 and A6 models. What are the main technical and design variations between these two options?

The biggest difference between the A8 and A6 models is their size. The A8 is a full-size luxury sedan, while the A6 is a mid-size option. This means that the A8 offers more space and luxury features, but also comes with a higher price tag.