The difference between driving and driving a car in English can be expressed as follows:
Driving refers to the general act of operating a vehicle, such as a car, truck, or motorcycle. It is a broad term that encompasses the skill and activity of controlling a vehicle on the road.
Driving a car specifically refers to operating a passenger vehicle, which is a type of vehicle designed for the transportation of passengers. It is a more specific term that focuses on the act of operating a car.
In summary:
Driving = The act of operating a vehicle.
Driving a car = The act of operating a passenger vehicle.