Instant film is a photographic film that is designed to be used in an instant camera (and, with accessory hardware, with many professional film cameras). The film pack contains the chemicals needed for developing, and the instant camera automatically initiates the developing process after a photograph has been taken. In most types of Polaroid instant cameras, the film is pulled out through rollers which break open a pod containing the chemicals. The chemicals spread out over the surface of the film, and the positive image appears a few seconds to minutes later. The chemicals have time delays built into them so that each layer of the film can be processed in the correct order.
...In February 2008, Polaroid announced it would cease production of all instant film; the company will shut down three factories and lay off 450 workers.