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Relief prints are made by other printing processes, in which the areas not to be printed of the block/plate are carved or incised. The ink is rolled onto the top of the surface and transferred to the paper. Often know as reverse intaglio. i.e.: wood cut or wood block printing. "Duck on the Pond" is an example of relief block print. Planographic prints are made by the process of printing impressions from a smooth surface rather than incising or relief areas on the plate. i.e.: lithography. * Note, the term "litho" is used to refer to both original lithographic prints and offset photolithographs, which are reproductions.
From What is Printmaking?