Why does the Audi A6 have a longer wheelbase than the A4?

I noticed that the Audi A6 has a longer wheelbase compared to the A4, but I'm not sure why. Can someone explain the difference and why it matters?

The longer wheelbase on the Audi A6 allows for better stability and handling, especially at higher speeds. It also provides more legroom and a smoother ride for passengers.

The A6 is a larger and more high-end vehicle than the A4, making the longer wheelbase a necessary feature for a more spacious and comfortable driving experience.