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Computer - A machine
that is programmable. The two main characteristics of a computer are:
All normal computers require the following hardware components:
The following are additional technology definitions:
Topology : The geometric arrangement of a computer system. Common
topologies include a bus, star, and ring. See the Network topology
diagrams in the Quick Reference section of Webopedia.
Computer Virus - A program or piece of code that is loaded onto your computer without your knowledge and runs against your wishes. Viruses can also replicate themselves. All computer viruses are manmade. A simple virus that can make a copy of itself over and over again is relatively easy to produce. Even such a simple virus is dangerous because it will quickly use all available memory and bring the system to a halt. An even more dangerous type of virus is one capable of transmitting itself across networks and bypassing security systems.
Since 1987, when a virus infected ARPANET , a large network used by the Defense Department and many universities, many antivirus programs have become available. These programs periodically check your computer system for the best-known types of viruses.
A virus is a program which can replicate itself, attach itself to other programs, utilize computer memory, send private information back to the host, and schedule activation at different times. The intent of most viruses is to cause an annoyance to the end user and/or utilize the computer for massive virus attacks.
A worm is a special type of virus that can replicate itself and use memory, but cannot attach itself to other programs.
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