Sometimes referred to as continuous feed paper or tractor feed paper, fanfold paper is specially manufactured paper for use with a continuous feed printer. Its pages are attached by perforated folds and separated by tearing after the pages are printed.
The discarded paper edges were referred to as snaf.
Fanfold paper is used with old dot matrix printers and is still used today. The picture is an example of a dot matrix printer with fanfolding paper.