A pulley system is a simple machine that uses a wheel and a rope to lift heavy objects. It consists of a wheel, called a pulley, which is mounted on an axle. When the rope is pulled down, it lifts the load attached to the other end. This system reduces the amount of force needed to lift the object, making it easier to move heavy items. Pulleys can be used in various configurations, such as a single fixed pulley or a block and tackle system, which combines multiple pulleys. They are commonly found in cranes, elevators, and theater rigging, helping to lift and lower objects safely and efficiently.