What is a worm?
A worm is a self-replicating computer programs that uses a network to send itself to other computers. Worms differ from viruses because they are stand-alone programs that do not attach themselves to other files or programs. A worm can spread itself automatically (without user intervention) over the network from one computer to the next, by taking advantage of automatic file sending and receiving features found on many computers.

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1. What is a virus?
2. What is a worm?
3. What is a Trojan horse?
4. More IT FAQ's
5. What is spyware?
6. Why should I protect my Computer?
7. What is a botnet?
8. What does encryption mean?
9. What is a network intrusion?
10. What does a firewall do?
11. What is malicious code?
12. What is a "sniffer?"