A monotype print is one that is not duplicated.  There is only one of each.  I make monotype prints with both oil based and watercolour ink, building up the image on a sheet of plastic by either painting or wiping away the ink.  The plate is printed onto damp paper, in single or multiple layers.  Sometimes, sufficient ink remains after the first print, to allow for a faint ghost to be printed too. I have recently forayed into screen print monotype, and in this case, an image is painted onto a screen and the ink is pulled through the screen onto the paper below.