A program that neither replicates or copies itself, but does damage or compromises the security of the computer. Which 'Computer Virus' it is?

A Trojan (or Trojan horse) is malicious software that disguises itself as legitimate software but does not replicate or copy itself. Unlike worms and viruses, Trojans rely on user deception to spread and typically create backdoors, steal data, or damage systems once executed. Joke programs are harmless, worms actively replicate, and hoaxes are false warnings about non-existent viruses. The defining characteristic of a Trojan is its non-replicating nature combined with malicious payload delivery.