The Monotype system is a system for printing by hot-metal typesetting from a keyboard. The two most significant differences from the competing Linotype machine are: * It is divided into two machines, the Monotype keyboard and the Monotype caster, which communicate by perforated paper tape. It is not necessary to have the same number of each machine. * The Monotype caster casts individual letters, which are assembled into lines in a fashion similar to classical movable type. This requires a more complex high-speed water-cooled casting mold, but only requires one matrix per possible character.