A exact typology is a sole photograph or more commonly a bulk of photographic work, that shares a extreme level of consistency. This consistency is mostly found inside the subjects, surroundings, photographic process, and performance or direction of the subject.

Typology was created by the German artists Bernd and Hilla Becher, who began working together in 1959 and married in 1961.

Hilla Becher was a German theoretical photographer. Becher was well known for her industrial photographs, or typologies, with long-time collaborator and husband, Bernd Becher.