A "Hardtop" refers to a type of automobile body style that features a rigid roof without a supporting pillar between the front and rear windows. This design allows for a sleek, uninterrupted appearance and provides a more open feel compared to traditional sedans. Hardtops can be found in both two-door and four-door configurations, often associated with classic cars from the mid-20th century. In addition to cars, the term "hardtop" can also apply to certain types of boats and outdoor structures, where a solid roof is used for protection against the elements. Hardtops are popular for their durability and ability to enhance the overall aesthetic of the vehicle or structure, making them a favored choice among enthusiasts and collectors.