There are many types of car body styles. They vary depending on intended use, market position, location, and the era they were made.
Volkswagen Country Buggy
Chrysler Sebring JS convertible with top down
1987 Cadillac Coupe Deville
A hardtop is a rigid form of automobile roof, typically metal, and integral to the vehicle's design, strength, and style. The term typically applies to a pillarless hardtop, a car body style without a
1965 Rambler Marlin, a pillarless hardtop
1969 Australian Dodge Phoenix four-door sedan has a B-pillar and painted window frames
1969 Dodge Phoenix 400 four-door hardtop. The lack of a B-pillar and window frames, added vinyl roof, wider C-pillar, and softened roofline create an appearance similar to a convertible.
1976 Chrysler New Yorker with doors open. Note the absence of a driver's vent window and half-height pillar to which the rear doors attach.