Printer is one of the output devices of computer, which is used to print the computer processing results on related media.

A copier is a device that obtains copies with the same magnification, enlargement or reduction from written, drawn or printed manuscripts. The advantage of the copier is its fast copying speed and simple operation. The main difference from traditional movable type printing, stencil mimeograph and offset printing is that it can obtain copies directly from the original without other intermediate means such as plate making.