The Kodak Instamatic Camera is a camera which was developed in the 1960s to simplify the use of film. The idea was to put in and out a film without any problems because the insertion of normal film often caused troubles. Even professional photographers did it wrong sometimes so that a whole series of their photos was destroyed. So Kodak developed the cassette film (126 film) a rather cheap alternative to usual film at this time, and the above mentioned Instamatic camera. You just have to insert the cassette into the camera – the film transport starts when you turn the film transportation wheel.
There is only one producer who still builds 126 films: the Italian company Ferrania. The trade name of the film is Solaris.
The format is square and it has 24 exposures. They don’t produce black and white film or slide film anymore.