Definitions for "Trojans"
a program that allows someone to enter into your computer and run it one form or another without you knowing it
A computer program that contains hidden functions that exploit the user's privileges with a resulting security threat. It can allow intruders easy access to the computer without the user's knowledge, change system configurations and can infect the computer with a virus.
A Trojan (or Trojan Horse) is a program which carries out an unauthorized function while hidden inside an authorized program. It is designed to do something other than what it claims to, and frequently is destructive in its actions.