How do elevators works?

The old school: An elevator pull itself using a pulley system

A pulley system is one of the original simple machines that was created by Archimedes B.C. used to lifted bucket of water. The "IDEA" of pulley system is to help make tasks easier. Pulley are essential to being able to move and lift heavy or large object. The simple principle behind pulleys makes these one of the most effective tools in the existence.