Trojan horse
A Trojan horse is a program which seems to be doing one thing, but is actually doing another. For example I browse some pictures and I download one of them which I like most, Here What am I doing? I am downloading a picture. If that picture is infected by Trojan then I also downloading Trojan but I don’t know about this thing. Trojan is working on my PC in hidden mode. A Trojan horse can be used to set up a back door in a computer system such that the intruder can gain access later.
The name refers to the horse from the Trojan War, with conceptually similar function of deceiving defenders into bringing an intruder inside. Actually in this war a huge horse made and all army hide in that horse, In this way they deceive their enemies.
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