The most common method of printing, which uses smooth (often rubber) printing plates. It works on the principle of lithography: that grease and water repel one another.
The printing plate is prepared using a photographic technique, resulting in a type image that attracts greasy printing ink. On the printing press the plate is wrapped around a cylinder and wetted and inked in turn. The ink adheres only to the type area, and this image is then transferred via an intermediate blanket cylinder to the paper.