What is: Offset printing ?

This refers to the printing process which makes use of a plate (usually lithographic). This plate which is being used must be receptive to the designs or images which are placed on it. Once placed, the ink would then be moved to a rubber blanket from the plate. This rubber blanket must be on the printing press. The aim of the rubber blanket would be to ensure that the ink is eventually moved to paper.
Sometimes, the offset printing would often be described as photo-offset or better yet, lithography.