What does the number of compartments in a car mean?

[Heidi]

Car compartments refer to the body type of the vehicle, commonly including two-compartment (hatchback) and three-compartment (sedan) cars. Structurally, if the engine compartment, passenger compartment, and trunk are all separated and this separation is fixed and irreversible, then it is a three-compartment car. A two-compartment car refers to a body with a luggage compartment that does not protrude from the vehicle body. In this case, the passenger compartment and luggage compartment are actually integrated, only separated by the rear seats or similar structures. This layout increases interior space but reduces trunk space accordingly. Therefore, it is mostly used in small and compact cars. A three-compartment car refers to a vehicle whose body structure consists of three separate compartments with different purposes: the front engine compartment, the middle passenger compartment, and the rear trunk. In summary, the main difference between two-compartment and three-compartment cars lies in the presence of a protruding trunk. If there is one, it is a three-compartment car; if not, it is a two-compartment car. In terms of usage, most two-compartment cars on the market are shorter than three-compartment cars, more flexible, and occupy less space.