Why is the Audi A7 often referred to as a 'four-door coupe'?

I have seen the Audi A7 being described as a 'four-door coupe' in articles and reviews. What is the reason behind this labeling and how does it differ from a traditional sedan?

The Audi A7 is called a 'four-door coupe' due to its sleek and stylish design that resembles a coupe, despite having four doors. This is achieved by the sloping roofline and horizontal lines along the sides of the car, giving it a sporty and elegant look.

The term 'four-door coupe' was popularized by Mercedes-Benz with their CLS model in 2005. It refers to a four-door car with a coupe-like silhouette, making it stand out from traditional sedans in terms of design.