An Instant camera is a camera that uses special film sheets which are prepared for an immediate photochemical image development after exposure, known as instant film formerly made by Polaroid Corporation. Therefore they have inbuilt mechanical features to trigger the self-development of each image after exposure.
Predecessors of the instant cameras were development-inside cameras like the Appareil Dubroni. Development chemicals had to be given into the camera after exposure of the film plate.
The modern instant cameras are generally credited to the scientist Edwin Land. In 1948 he unveiled the first commercial instant camera "the Land Camera", just one year after he unveiled the instant film in NYC. The earliest instant camera was invented in 1923 by Samuel Shlafrock.