What is a Trojan horse?
A Trojan horse is a destructive program masquerading as a harmless computer program. The purpose of most Trojan horses is to get access to your computer from another location. Trojan horses are often found attached to programs you receive in e-mail or download from the Internet.

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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?"