A wheelchair, as the name suggests, is a chair with wheels. They are used by people with physical disabilities, as well as by thoughtless people who might wish to bypass queues and go straight to the front of lines at the movies or airports.
There are primarily three types of wheelchairs:
Manual Wheelchairs which are tiring on the arm muscles, have things that break off easily, and are lots of fun to go down travelators in.
Electric Wheelchairs, which are noisy, heavy and bulky, yet more effective than manual chairs when running over unsuspecting bipeds.
Hospital Wheelchairs which are tiring, noisy, heavy, bulky, easily broken as well as being very uncomfortable to ride around in.