PgUp (page up), PgDn(page down), Insert and Delete. But there are several types
of pointing device that are used to move the cursor and usually work in
conjunction with the keyboard. The most common pointing device is the mouse, so
called because it slides over the desktop and has a wire or ‘tail’ attached to the
computer.
When referring to hardware, a scanner or optical scanner is a hardware input
device that optically "reads" and image and converts it into a digital signal. For
example, a scanner may be used to convert a printed picture, drawing, or document
(hard copy) into a digital file which can be edited on a computer.
Another pointing device is a trackball, which performs like a stationary upside-
down mouse. A joystick is another pointing device, one that is usually associated
with playing computer games.
An output device is a piece of computer hardware that receives data from a
computer and then translates that data into another form. That form may be audio,
visual, textual, or hard copy such as a printed document.
There are four different
categories of output device: visual, data, print, and sound.
Monitors and printers are two of the most commonly used output devices used
with a computer. Most computer outputs come in two forms: text and graphics.
Printers are output devices which produce hardcopy. Printers come in all kinds of
shapes and sizes, with varying capabilities and mechanisms for printing. There are
different types of printers: a letter quality printer and a laser printer,
an ink jet
printer.
A laser printer provides high-quality non-impact printing and offers the highest
quality texts and graphics printing for the desktop. A letter quality printer allows
the production of documents with a high quality of printing at a relatively low cost.
Like lasers, Ink jet printers are able to print many different types of fonts and
graphics.
The key distinction between an input device and an output device is that an input
device sends data to the computer, whereas an output device receives data from the
computer.
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