A coupe has just 2 doors. Reducing the number of doors to the passenger compartment makes the vehicle structure more rigid.
Traditionally, it has 2 seats, with 2 smaller seats behind, for occasional use. In this form it is a close-coupled 4-seater, and can be made in a fixed head or drop-head configuration. A coupe is now regarded as being any fixed head vehicle with 2 doors.
Source: CDX Global
