Here's how it works:

* Fixed pulley: A fixed pulley is attached to a stationary object. When you pull on the rope, the pulley changes the direction of the force, allowing you to lift an object upwards by pulling downwards.

* Movable pulley: A movable pulley is attached to the object you're trying to move. When you pull on the rope, the pulley changes the direction of the force and also reduces the amount of force needed to lift the object.

Let me know if you'd like more details on how pulleys work!