Hacking:

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.

For more information about the topic Computer virus , read the full article at Wikipedia.org
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