What Are the Differences Between the Audi 80, 100, and 200 Models?

I am looking into buying an Audi car, but I am confused about the differences between the 80, 100, and 200 models. Can someone please explain the main technical and performance differences between these models? Thank you.

The main difference between the Audi 80, 100, and 200 models lies in their engine size and power. The 80 has a smaller engine and is suitable for city driving, while the 100 and 200 have larger engines and are more powerful on the highway.