Hacking Question:
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What is a trojan/worm/virus?

Answer:

Trojan: A program that when run by a user does an action that the
users did not expect, or the program was not designed to do.

Virus: A portion of code that attaches it self to other executable
files in the attempt to replicate and spread itself.

Worm: A stand alone program that acomplishes a task in the
background by replicating and moving though a computer
network.

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