A computer virus is 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
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.
Source: http://www.webopedia.com
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