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Trojan Horse (Computing)

A trojan horse, or trojan, is a non-self-replicating type of malware which appears to perform a desirable function but instead facilitates unauthorized access to the user's computer system. trojans do not attempt to inject themselves into other files like a computer virus. trojan horses may steal information, or harm their host computer systems. trojans may use drive-by downloads or install via online games or internet-driven applications in order to reach target computers.