Analog photography, also known as film photography, is a term usually applied to photography that uses chemical processes to capture an image, typically on paper, film or a hard plate. These processes were the only methods available to photographers for more than a century prior to the invention of digital photography, which uses electronic sensors to record images to digital media. Analog electronic photography was sometimes used in the late 20th century but soon died out. Photographic films utilize silver halide crystals suspended in emulsion, which when exposed to light record a latent image, which is then processed making it visible and insensitive to light.