What is a virus?
A virus is a computer program that can copy itself and spread to other computers without the knowledge of the user. Some viruses attach to program files, so when the infected file runs, the virus also runs. Other viruses sit in a computer's memory and infect files as the computer opens or modifies them.

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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?"