Sedans and hatchbacks differ most clearly in how the rear cargo area is enclosed and accessed. A conventional sedan uses a separate trunk lid beneath a fixed rear window. A hatchback opens a larger rear door that includes the window, connecting the loading opening directly with the rear interior space.
That change affects which objects can enter, how cargo space combines with folding seats, and how luggage is separated from passengers. It does not establish which car has more rear-seat room, better fuel economy, or lower costs. Names and rooflines can blur the distinction, so inspect how the actual rear opening works rather than relying on a silhouette alone.