A Trojan horse is a virus that masquerades as a useful program or file.

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A Trojan horse is a type of malware that disguises itself as a legitimate program or file in order to gain access to a computer system and carry out its malicious activities. It is named after the Trojan horse from Greek mythology, which was a wooden horse filled with soldiers that was used to sneak into the city of Troy. Similarly, a Trojan horse virus "sneaks" into a computer system by appearing to be something that is desirable or harmless, but once it is installed it can cause damage, steal information, or spy on the user.

A Trojan Horse Is a Virus That Masquerades as a Useful