Ink Jet Printer: This is the most ordinary printer which remains connected to the computer. An ink-gun with its narrow mouth projects very small particles of ink. These small particles are positively charged. These ink particles move through the space between two plates. These positively charged ink particles are repelled by the positive plate and attracted by the negative plate.
A computer controls the voltage of the plates in such a way that the plates are sometimes positively charged and sometimes negatively charged. And the ink particles fall on moving paper scattered in different places to give the necessary shape of letters and pictures. For colour print four kinds of colour are used.