The term 'style of car' can refer to two different types of cars: hardtop and hatchback. A hardtop is a car with a solid roof that is not removable, while a hatchback is a car with a rear door that opens upwards to provide access to the cargo area. Both styles of cars have been popular for decades, with hardtops being more common in the 1950s and 1960s, and hatchbacks becoming more popular in the 1970s and 1980s.