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Trojan (or trojan horse) is a program in which malicious or harmful code is contained inside apparently harmless programming or data in such a way that it can get control and do its chosen form of damage, such as ruining the file allocation table on your hard disk. In one celebrated case, a trojan was a program that was supposed to find and destroy computer viruses. A trojan may be widely redistributed as part of a computer virus. Trojan viruses often are not intended to be harmful but due to hijacking, severe or multiple security flaws, the victim downloading the software could also get a trojan virus.

The term comes from Greek mythology about the Trojan War, as told in the Aeneid by Virgil and mentioned in the Odyssey by Homer. According to legend, the Greeks presented the citizens of Troy with a large wooden horse as a gift, the citizens took the horse into the city which was a big mistake. Since expert warriors were inside it, they had the perfect position to attack. During the night, the warriors emerged from the wooden horse and overran the city.

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