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VIRUS
A harmful program that a user
runs unintentionally. A virus might damage files, change settings
on the computer, or replicate itself and bring a user's system to
a standstill.
More Detailed Definition:
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.
Some people distinguish between general viruses and worms. 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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