With so many options available it becomes quite difficult to decide which vehicle to purchase. One of the most popular vehicles available in the market today is a sedan. By definition, the sedan is a car with two full rows of seats and four doors. It is roomy, comfortable car with ample room for five adult passengers including a driver. This feature of sedan to carry almost five passengers from medium to large makes it a popular choice among people. Four-door sedans generally have two or three side windows, one on each door (vent windows not counted). The sedan has fixed roof that is full-height up to the rear window.