Answer:
Flexible Roll Film.
https://en.wikipedia.org/wiki/Roll_film (the cite)
Explanation:
Photography didn’t truly become accessible to amateurs until the mid-1880s when inventor George Eastman began producing the film on rolls. The film was more lightweight and resilient than clunky glass plates, and the use of a roll allowed photographers to take multiple pictures in quick succession. In 1888, Eastman used flexible film as the primary selling point of his first Kodak camera, a small, 100-exposure model that customers could use and then send back to the manufacturer to have their photos developed.
(Hope this is legit!)