What is the difference between a collotype and a lithograhph?

Both the collotype and lithograph are from the printmaking world of art, in which the image is rendered on a "plate", inked and run through a printing press.

In lithography, the plate may be a litho stone or a piece sheet metal. The image is drawn (in reverse) on the plate with a lithography pencil. An artist will often draw from a mirror which is reflecting his visual reference in reverse, so that she/he can draw it in reverse so that the final printed image will be oriented correctly.

The collotype's plate is a board (matte board, illustration board, etc.) that has been built up or cut into keeping in mind that the raised areas print out differently than the low areas. Therefore, it is a relief print. The surface area of the plate needs to be prepared for printing to prevent the ink and other substances used in the printmaking process from soaking into the plate. I prefer polyurethane.