VIRUS: A virus is a self-replicating program that spreads by inserting copies of itself into other executable code or documents. While viruses can be intentionally destructive (for example, by destroying data), many other viruses are fairly benign or merely annoying. Some viruses have a delayed payload, which is sometimes called a bomb. For example, a virus might display a message on a specific day or wait until it has infected a certain number of hosts. A time bomb occurs during a particular date or time, and a logic bomb occurs when the user of a computer takes an action that triggers the bomb. However, the predominant negative effect of viruses is their uncontrolled self-reproduction, which wastes or overwhelms computer resources.
WORM: A computer worm is a self-replicating computer program, similar to a computer virus. A virus attaches itself to, and becomes part of, another executable program; however, a worm is self-contained and does not need to be part of another program to propagate itself. They are often designed to exploit the file transmission capabilities found on many computers.
SPYWARE: Any software that subverts the computer's operation for the benefit of a third party.
TROJAN (Horse): A specialized computer virus that enters via stealth or through another program and deposits and/or executes an often destructive bit of computer code.
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