The elevator (or lift in the Commonwealth excluding Canada) is a
type of vertical transport equipment that efficiently moves people
or goods between floors (levels, decks) of a building, vessel or
other structure. Elevators are generally powered by electric motors
that either drive traction cables or counterweight systems like a
hoist, or pump hydraulic fluid to raise a cylindrical piston like a
jack.
An escalator is a moving staircase a conveyor transport device for
carrying people between floors of a building. The device consists
of a motor-driven chain of individual, linked steps that move up or
down on tracks, allowing the step treads to remain horizontal.
Escalators are used around the world to move pedestrian traffic in
places where elevators would be impractical. Principal areas of
usage include department stores, shopping malls, airports, transit
systems, convention centers, hotels, arenas, stadiums and public
buildings.
The benefits of escalators are many. They have the capacity to move
large numbers of people, and they can be placed in the same
physical space as one might install a staircase. They have no
waiting interval (except during very heavy traffic), they can be
used to guide people toward main exits or special exhibits, and
they may be weatherproofed for outdoor use. A non-functioning
escalator can function as a normal staircase, whereas many other
conveyances become useless when they break down.
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