Photographic film is used to record pictures. Films are sensitive to light. A piece of film will record any lights. Films can only be used for one time, after it has make or record a picture, it can not be used again. When not in use, film needs to be covered from lights, otherwise it will record any lights that shine on it. This will make it useless to record a picture later on. Film comes in a can called canisters to cover it from lights. Film needs the right amount of light to make a picture; If the picture is too bright or too dark, it will not record correctly. The longer that the film keeps recording, the more light it will get. If what is being photographed is bright, it will be recorded faster. If it's darker, the film will need more time to record.

Different kinds of films have different light sensitivity, some will need a long time to record the picture, some will need less, film that needs less time to record the picture are known as "faster" film. Different speed of films are marked with an ISO number, the higher the number, the faster the films. Usual ISO number for films are 100, 200 and 400. To see the recorded picture; the film needs to be processed chemically. Film can only make picture from focused lights, if there is no lens to focus light, the film will only turn white from receiving just the light. A film with an ISO level of 200 will need half the time to record a picture than a film with an ISO level of 100 (for the same scene).

Films also comes in different sizes, the usual camera film comes in metal can or canisters, but there are other camera films that comes in paper wrappings or in single sheets.

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