Inkjet printer.

To printer image on an paper, hundreds of tiny jets or nozzles expels ink droplets on paper or any other medium and perform their function. A single pixel which is picture element is corresponded by a single droplet of ink. Only black ink is used by black and white printer. While printing color like ( magenta, yellow, cyan and black) are used by color printer to overprint combination of this color and to create a full colored image. Line of pixel are created by printhead with nozzles embedded in it which moves sideways across paper. Paper moves slightly forward as printing gets in progress. For ejection of ink, two basic methods are used by printer: first thermal method in which an expanded ink bubble is formed by heating to ink so as to expels it out in droplets form  and second by piezoelectric method in which ink droplets are pushed by a crystal by expanding electric current. A various sources of input can be given to printer in form of memory card, universal serial bus (USB), and other storage devices.