A light bulb, or electric light or electric lamp is a device that produces light fromelectricity. In addition to lighting a dark space, they can be used to show anelectronic device is on, to direct traffic, for heat, and many other purposes.
Early people used candles and oil lamps for light (often from whale oil). Crude incandescent lights were made in the early and middle 19th century but had little use. Improved vacuum pumps and better materials made them shine longer and brighter late in the century. Electric generator stations brought electricity to urban and later rural areas to power them. Later gas discharge lights including fluorescent lights use less electricity to make more light.