What are the key differences between the Audi 80 and Audi A4?

I'm considering purchasing either the Audi 80 or the Audi A4, but I'm not sure which model would be a better fit for me. Can someone please provide a clear comparison of the features and specifications of these two models?

The Audi 80 is a compact executive car that was produced by the German automaker between 1972 and 1996, while the Audi A4 is a mid-size car that has been in production since 1994. The A4 is larger and more modern than the 80, with updated technology and features.