- For the original from Greek mythology, see Trojan Horse.
A trojan horse (often just called trojan) is a kind of software that is used for malicious purposes. A trojan horse is a special type of malware that pretends to do a certain thing, but in reality, it does something else, such as allow a stranger to read and change the computer's information. In some cases the user notices, in other cases they do not. Spyware programs are examples of programs that work as trojans. view more...