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| | Computer Viruses [encyclopedia] (Site not responding. Last check: 2007-11-06) |
 | | In computer science a virus is a piece of program code that, like a biological virus, makes copies of itself and spreads by attaching itself to a host, often damaging the host in the process. |
 | | A small percentage of viruses are the result of computer code that operates in an unexpected manner, but the majority of viruses are programs deliberately written to interfere with, or damage, other programs or computer systems. |
 | | Many such viruses have a delayed payload, playing a message on a specific holiday, day of the month, or time of day; or waiting for a certain number of infections or reboots, or randomly occurring with a small chance. |
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