Offset printing process consists of several parts
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Variations

variable-size printing, a printing process that uses removable printing units, inserts, or cassettes for one-sided and blanket-to-blanket two-sided printing;[

keyless offset, a printing process that is based on the concept of using fresh ink for each revolution by removing residual inks on the inking drum after each revolution. It is suitable for printing newspapers;

Dampening system

Most lithographic plates function on the principle of water and ink receptive areas. In order for ink to adhere only to the image areas on the plate, a layer of moisture must be placed over the nonimage areas. The dampening system accomplishes this by moistening the plate consistently throughout the press run.

Inking system

The goal of any inking system is to place a uniform layer of ink across every dimension of the printing plate. The lithographic process is unique in that it requires the ink form rollers to pass in contact with the nonimage areas of the plate without transferring ink to them.