Cassette film is the correct term for rollfilm delivered in a two-spool package in which it stays when exposed by the camera.
Some call such film packs cartridges, but "cartridge" is a more general term which also comprises 120 film rolls and other rollfilm types which are delivered on just one spool. That other kind of film rolls are called film cartriges because they resemble hunting ammunition cartridges!
We can define: Rollfilm CARTRIDGES are delivered on ONE spool, CASSETTE FILM is packaged in cassettes which obviously contain TWO spools, the first with the unexposed film, the second to coil the exposed film so that rewinding film becomes superfluous. The film stays in the cassette when it's exposed by the camera.
Popular cassette film types
These three cassette film types were all introduced by Kodak on the peak of the company's market power in the 1960s/70s. That was also the age of the Compact Cassette audio tape.
other cassette film
|Minox B with appropriate film cassette|
image by Steve Harwood (Image rights)