Which device circulates coolant through the engine and then to radiator?

The water pump is a mechanical device that circulates coolant through the engine and then to radiator. The water pump is usually driven by the engine's timing belt or chain. When the engine is running, the water pump impeller spins and creates a suction that draws coolant from the bottom of the radiator. The coolant is then pumped through the engine block and cylinder head, where it absorbs heat from the engine. The heated coolant then exits the engine and flows back to the radiator, where it is cooled down by the air flowing through the radiator fins.