Reference Terms
from Wikipedia, the free encyclopedia

Computer virus

A computer virus is a self-replicating computer program written to alter the way a computer operates, without the permission or knowledge of the user.

Though the term is commonly used to refer to a range of malware, a true virus must replicate itself, and must execute itself.

The latter criteria are often met by a virus which replaces existing executable files with a virus-infected copy.

While viruses can be intentionally destructive—destroying data, for example—some viruses are benign or merely annoying.

Note:   The above text is excerpted from the Wikipedia article "Computer virus", which has been released under the GNU Free Documentation License.
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July 1, 2015

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