What is the difference between Audi R and A?

[MacStephen]

Audi R and A have the following differences: A Series: The A Series represents regular sedans, which are Audi's civilian car versions. Most of Audi's models belong to the A Series, focusing on business and economic performance. The main models of the Audi A Series include: the A1 series is a compact car; the A2 series is a small station wagon; the A3 series is a compact car; the A4 series is a mid-size sedan; the A5 series is a mid-size sports car; the A6 series is a mid-size luxury sedan; the A7 series is a large sports car; and the A8 series is a full-size luxury sedan. R Series: The R Series represents sports cars, and the R Series is the pinnacle of the quattro department, embodying Audi's most advanced automotive technology. It is entirely derived from the world's top racing event, Le Mans, and is a representative work from racing cars to civilian vehicles. Currently, the "R" Series has only one model, the R8.