What are the differences between the Audi A4 and Audi A6 models?

I am considering getting an Audi, but I'm not sure which model would be the best fit for me. What are the key differences between the A4 and A6 models? Are there any features or specifications that set them apart? Any recommendations on which one to choose?

Both the Audi A4 and A6 are great cars in their own right, with some notable differences. The A4 is a compact executive car, while the A6 is a mid-size luxury car. The A4 is more affordable and fuel-efficient, while the A6 offers better performance and more advanced technology.