8mm films can be found in different types.
Standard 8mm Film:
Released before World War 1, the measure refers to the width of the film strip.
Double 8:
These are effectively called the 16 mm films.
Super 8 Films
Launched in 1965, super 8 film is an upgraded and superior version of 8mm films.
Single 8 Films
These are a different version of super 8 films. Introduced by the Fuji; it is contained within a different cassette.