A monotype is one of a kind, a unique piece of artwork. It is the simplest form of printmaking, requiring only pigments, a surface on which to apply them, paper and some form of press.
Monotypes are pulled impressions that were drawn or painted on a metal or plexiglass plate. The images are created through applications of ink that are rolled, brushed, daubed or otherwise applied and manipulated and then, with the material, usually paper, that is to accept an impression, are "pulled" with the use of a press.
Monotypes are inherently unique because only one or two impressions may be pulled before the ink is used up.