A coupe has historically been considered a two-door car with a trunk and a solid roof. This would include cars like a Ford Mustang or Audi A5—or even two-seat sports cars like the Chevrolet Corvette and Porsche Boxster. Recently, however, car companies have started to apply the word "coupe" to four-door cars or crossovers with low, sleek rooflines that they deem "coupe-like." This includes vehicles as disparate as a Mercedes-Benz CLS sedan and BMW X6 SUV. At Car and Driver, we still consider a coupe to be a two-door car.