• A trojan horse is a computer program that appears to perform a useful and innocent function. However, it contains hidden functions that use approved authorizations assigned to the user when they start the program. For example, it may copy your internal authorization information from your computer and send it back to the originator of the trojan horse.
Example Sentences:My computer is infected with a trojan horse. Can anyone tell me how I can get rid of it?
You must have picked up a trojan horse from that email attachment you opened this morning.