Merriam-Webster defines a Trojan horse as "a seemingly useful computer program that contains concealed instructions which when activated perform an illicit or malicious action". When you hear the term "Trojan horse", it brings to mind the story of the Iliad by the Greek poet Homer. In this story, a large hollow wooden horse was filled with many Greek soldiers and brought within the walls of the city of Troy. The soldiers then destroyed the city. The computer version of this is almost exactly the same.
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