Illumination or lighting is the deliberate use of light to achieve a practical or aesthetic effect.

  • Illumination might be provided through the use of artificial light sources like lamps and light fixtures, or natural illumination by capturing daylight.
  • Daylighting (using windows, skylights, or light shelves) is sometimes used as the main source of light during daytime in buildings.
  • Specialised forms of artificial lighting have been developed to suit every possible situation and purpose where natural light is not available.