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VIRUS
 | A program which “infects” other programs by modifying them to include a copy of itself. It cannot activate itself independently, but only when its host program is explicitly invoked. It may contain a “Trojan Horse”. (IC)
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| A bacterium or sometimes called a “chain letter” is a program which propagates itself by electronic mail to everyone in the victim’s mailing list. It may also contain a “logic bomb” or “Trojan horse”. (IC) |
| A worm is a program that can run on its own and can propagate itself to other machines on a network. It can be a useful tool for distributing information such as mail, or it can be used to spread a time bomb or Trojan horse - if it can gain access to the host. (IC) |
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