Some small hybrid cars and sport utility vehicles also have spoilers. what is their purpose? Is it the same or different from the spoiler on a sports car?

Spoilers on hybrid cars and sport utility vehicles are usually designed to create a smoother, less turbulent airflow over the rear of the vehicle. This reduces drag (air friction). Sports car spoilers are most often designed to increase rolling friction, not to decrease air friction. Spoilers on different types of cars serve different purposes.