To begin with, it must be taken into account that printers very in cost, speed, print quality and other factors such as noise or compatibility. In fact, printing technology is evolving so quickly that there is always a printer for every application or personal requirement.
Dot-matrix printers use pins to print the dots required to shape a character. they print text and graphics and nowadays some of them can print up to 500 characters per second (cps);however, they produce relatively low resolution output-72 or 144 dots per inch. THIS LEVEL OF QUALITY, WHILE suitable for preliminary drafts, is not recommended for reports or books that have a wide audience . They are slower than laser printers but much cheaper.
One common type of non-impact printer is an ink-jet printer . It operates by projecting small ink droplets onto paper to form the required image. This type of printer is quite fast, silent and not so expensive as a laser printer . nevertheless, you can expect high quality results because there are some ink-jet printers on the market with a resolution of 720 dpi.
bubble-jet printers work the same way.
laser printer produce output at great speed and with a very high resolution of 600/2, 400 dpi. they scan the image with a laser beam and transfer it to paper with a special ink powder. they are constantly being improved. in terms of speed and image quality they are preferred by experts for different reasons: they have a wider range of scalable fonts,they can produce graphics, and they have many other advantages. it goes without saying that they are still expensive for home users.