Photography is image-making that makes use of light to produce a picture. In some cases, electromagnetic radiation outside the field of visible light is also used to create images, usually for scientific or astronomical purposes. In most cases, the light will be captured via a lens which is then recorded digitally or reacts with a light-reactive membrane, known as film. Photography can be used to create stills or moving images. Prior to the invention of modern photography, people would paint or sketch images to record them. Although such practices continue to this day, taking photographic images is now much more common for anything from recording evidence of crimes to portraiture.