The first part of the chapter covers the film structure, different layers in the film (Base, Substratum and Top coat), Film technology (Gelatin, Silver halides, Spectral sensitivity and Grain types). The second part explains about film types and packing, Characteristic curve, definitions for film gamma, speed, contrast and latitude. The last part explains about types of film (Dental film, Mammography film, Multiformat camera film, Laser printing film) and handling of X-ray film.