A skateboard is a symmetrical board used for both skatepark and street. In a nutshell, a skate is a tricks board, with a nose and tail, equipped with small, hard wheels. These boards are ideal for jumping and learning flip tricks and sliders, and can be used on smooth, clean surfaces, as at skatepark.
A cruiser is a utility board, halfway between a longboard and a skateboard. The cruiser borrows from the skateboard its fairly short format, and a kicktail at the rear for easier maneuverability. From the longboard, it borrows trucks, often higher and more playful, and above all larger, softer wheels.
As a result, a Cruiser is better suited to all types of terrain, especially the grainy asphalt found on most roads. On the other hand, the cruiser is less suited to tricks, as it is heavier.