Light sources are objects that emit light, and there are several types of light sources. Lasers are a type of light source that emits a narrow beam of light, usually in the form of a visible laser pointer or a powerful laser used in industrial applications. Lamps are another type of light source that use electricity to produce light, such as desk lamps or street lamps. Bulbs are similar to lamps, but they use a filament to produce light, such as incandescent bulbs or fluorescent bulbs. Finally, oil lamps are a type of light source that uses a wick and combustible fuel to produce light, such as kerosene lamps or candles.