Virus
A program or piece of code that is loaded on to your
computer without your knowledge and runs against your wishes.Like any other
program,it contains instructions that tell your computer what to do.
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Viruses can also replicate themselves.
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All computer viruses are manmade.
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A simple virus that can make a copy of itself
over again is relatively easy to produce.
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A virus can be very destructive; it could format
your hard drive, overwrite your hard drive boot sector, or delete files and
render your machine inoperable.
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Even such a simple virus is dangerous because it
will quikly use all available memory and bring the system to a halt.
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An even more dangerous type of virus is one
capable of transmitting itself across networks and bypassing security sytems.
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