Photography is a technique, including processes and materials, that consists in fixing or reproducing over time accurate images of the real world on a photosensitive medium (silver photosensitive chemical with film or paper, digital sensor) by exposure to visible or non-visible light, such as infrared.

Instant photography makes it possible to obtain silver photographs directly, without having to go through separate film processing and paper printing operations. The most famous process is the Polaroid brand.