A hardtop is a type of auto with a solid roof that does not open. It typically has two doors and is often a coupe or convertible. A SEDAN is a type of auto with four doors and a trunk. It is usually larger than a hardtop and is designed for comfort and convenience. A Saab is a type of auto manufactured by the Swedish company Saab Automobile. It is known for its aerodynamic design and turbocharged engines.