A photograph (or photo) is a picture formed by light hitting a light-reactive surface using a photographic film. Different cameras produce photographs however nowadays smartphone cameras are often used to produce digital photographs. Photographs are a great way to collect memories. Photography is an art form as well as a science of producing beautiful images. The principle of the photograph is antique with the discovery through the camera obscura or dark room. Non digital. Photographs can be developed in a dark room from negatives. Stock photography is the supply of photographs for a specific use. Many famous fashion photographers make a living through photographing models.