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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