Bicycle

A bicycle, often called a bike[2] (and sometimes referred to as a "pushbike",[3] "pedal bike",[4] "pedal cycle",[5] or "cycle"[6]), is a human-powered, pedal-driven, single-track vehicle, having two wheels attached to a frame, one behind the other.[7] A person who rides a bicycle is called a cyclist, or bicyclist.
Bicycles were introduced in the 19th century in Europe and now number more than a billion worldwide, twice as many as automobiles.[8] They are the principal means of transportation in many regions. They also provide a popular form of recreation, and have been adapted for such uses as children's toys, general fitness, military and police applications, courier services and bicycle racing.