This is a general term which relates to the use of
computers as an aid to creating and maintaining data, i.e. information.
IT is related to all aspects of managing and
processing information, especially within a large organisation.
Computers are critical to managing information, and
computer departments within large organisations are often called IT
departments. Alternative phrases are IS departments (Information Services) or
MIS departments (Management Information Services). People working with computers within large
companies will often refer to their job, as “working in IT”.
The second type of computer that you may be familiar with is a laptop computer. Laptops are battery or AC-powered personal computers that can be easily carried and used in a variety of locations be a car, a taxi or airjet. Example Laptop Computer The primary benefit of a laptop computer is its small size and easy portability . They use special screens, rather than the traditional bulky VDUs (Visual Display Units), which allows for longer battery life as well as portability. A laptop computer is sometimes called a notebook computer because of its size. Notebooks and Palmtop computers A newer term, “Notebooks”, simply indicates a VERY small laptop. These are especially popular with salespersons on the move or people giving presentations. While they tend to still be more expensive than an equivalent Desktop computer, they can now match the power of a Desktop computer. Palmtops are even smaller computers which can literally...
With pen input , users write, draw, and tap on a flat surface to enter input. The surface may be a monitor, a screen, a special type of paper, or a graphics tablet. A light pen is handheld input device that can detect the presence of light. To select objects on the screen, a user presses the light pen against the surface of the screen or points the light at the screen and then presses a button on the pen. A stylus is a small metal or plastic device that looks like a tiny ink pen but uses pressure instead of ink. Some mobile computers and nearly all mobile devices have touch screens that recognize pen input. Most of these devices include a pressuresensitive digital pen or stylus. Pressure-sensitive digital pens typically provide more functionality than a stylus, featuring electronic erasers and programmable buttons. Computers and mobile devices often use handwriting recognition software that translates the handwritten lett...
Printers produce hard copies printed on permanent material. It is called hard copy because it is tangible and can not be easily changed. There are two categories of printers, impact and non impact printers. I mpact Printers The Dot matrix printer is an example of an impact printer because it uses tiny dots to produce letters and graphics. They make a lot of noise and are slow. Some examples of Dot matrix printers are the Epson LX300, Epson LX780 and the Citizen Prodot 24. Ink Jet printers. These a re examples of a non-impact printer since they use nozzles to spray characters on to the page. They are between the dot matrix and laser printers in terms of speed and quality. Some examples are Canon BJC 620, HP 610C, HP 590C, Epson Stylus Colour 300 and the HP 859Cix. Laser Jet printers use the principle of a photocopier and use a laser beam to print characters on to a page. They are ...
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