Output Devices

Output Devices
Once the user has managed to input the  commands and information required into the computer, there are several output devices for the computer to pass that information back to the user. The most obvious is the computer monitor, sometimes known as a VDU or visual display unit. Modern monitors offer high resolution (quality) images and generally do not suffer from the irritating flicker or strobing effect that were common a few years ago. Nontheless, it is important to select the largest, brightest screen that will fit in your workplace and that your wal­let can afford, as you will spend a lot of time looking at it. It is expected that the older CRT (cathode ray tube) monitors will be replaced by flat panel screens within the next few years, just as the older televisions are being replaced by larger, flatter screens. These LCD (or liquid crystal display) are considerably lighter and produce far less heat than the older monitors. One of the most important output devices to add to any computer system is a printer. The best value currently are inkjet printers which can produce stunning quality colour prints. They work by silently squirting microscopic droplets of ink at the page from a colour and a black ink  cartridge. The resolution and definition of image from some of these printers rivals the prints produced by traditional photo develop­ers. Inkjet printers can be slow and the cost of replacement cartridges can be very high.

Laser printers generally produce black and white prints (although colour laser printers are reducing in cost all the time) and are preferred in offices as they are much faster than inkjet printers, have a higher paper capacity and are cheaper per page than inkjets.
REFERENCE
http://en.wikipedia.org/wiki/Output_device