TROJAN HORSE
A Trojan horse is what seems to be legitimate software, but that does something destructive when run. See
Virus
A computer program which carries within itself a means to allow the creator of the program access to the system using it. See also: virus, worm. See RFC 1135.
A destructive program that masquerades as a harmless one.When you run a Trojan horse program,believing that it has a useful function,it will instead,for example,erase your hard drive.See virus and worm.