An elevator or lift is a vertical transport vehicle that efficiently moves people or goods between floors of a building. They are generally powered by electric motors that either drive traction cables and counterweight systems, or pump hydraulic fluid to raise a cylindrical piston.
The first electric elevator was constructed by the German engineer Werner von Siemens in 1880.
A hydraulic elevator or lift is used to lift very heavy objects. It is a machine that uses pressurized liquid in a confined space to transfer pressure. The pressure of the fluid is transferred from one end of the hydraulic system to the other.