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Virus: A set of instructions that when executed inset themselves into other programs and presumably intend bad consequences.
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Bacterium: A free standing program that replicates itself and causes harm by consuming resources
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Worm: Similar to a bacterium that propagates over a network
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Trapdoor: an undocumented entry point which is written into a program often for debugging purposes
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A virus can install trapdoors as it propagates
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Trojan horse: Instructions hidden in a seemingly useful program which can or do perform bad things. Viruses add Trojan horses to originally good programs
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Logic bomb: malicious instructions that trigger on some particular event or time in the future
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