A printing process that is actually an improvement on its ancestor, lithography: it replaces the stone with a flexible plate fitted onto a cylinder and the addition of an offset blanket around a blanket holder cylinder (offset cylinder) between the plate holder cylinder and the paper. This is one of the processes that is capable of producing the largest quantities of printed paper (stamps, magazines, newspapers, packaging paper, books, etc.) and with a “flat” technique, i.e. there is no relief or recesses on the printing form. It is based on the principle of the repulsion of two antagonistic products: water and greasy ink. This process, depending on the machines used, can be used to print sheets one by one (sheet-fed presses) or from a continuous roll (web-offset presses).