An impact sprinkler is a type of irrigation device that uses a rotating nozzle to spray water in a circular pattern. The nozzle is attached to a long arm that is connected to a drive mechanism, which causes the nozzle to rotate. The force of the water coming out of the nozzle creates an impact as it hits the ground, which helps to evenly distribute the water. Impact sprinklers are ideal for irrigating large open areas such as lawns and playing fields.