Rather than requiring regular film or ink cartridges, an instant camera requires instant film (also called instant photo paper). This film, which comes in packs of 10, is loaded in the camera before use. When you click the shutter button to take your photo, the photo is projected onto the film. The film (which contains chemicals) is drawn across rollers and comes out of the camera. The chemicals react to the light, and after a minute or two your photo is finished developing.