A printer is one of the output devices of a computer that prints the results of computer processing on a related medium. There are three indicators that measure the quality of a printer: print resolution, print speed, and noise. There are many types of printers, according to whether the printing element has a hitting action on the paper, it is divided into percussion printers and non-impact printers. According to the printing character structure, it is divided into holographic character printer and dot matrix character printer. According to the way a line of words is formed on paper, serial printers and line printers. According to the technology used, cylindrical, spherical, inkjet, thermal, laser, electrostatic, magnetic, light-emitting diode and other printers.
