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Question: What’s the difference between a worm and a virus?

Answer: Both worms and viruses are self-replicating programs that do damage to computers. But a virus requires a human to do something — download a file, exchange a disk — and is spread when an infected file or disk moves from one machine to another. Worms use computer networks to duplicate themselves. The Love Bug is both a virus and a worm; it’s a virus because it breeds on a host computer’s hard drive and a worm because it also reproduces over a network.

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