I will today tell you that
what a computer virus really means.
A computer virus is a
program or a code that is loaded into your computer
without your knowledge and runs against your wishes. Viruses can also replicate
themselves. All computer viruses are man-made. 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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