Computer Virus
A computer trojan is an application or software that you may download to install and use on a computer
It may also be unknowingly downloaded through clicking and accepting certain Internet prompts while browsing online
A more popular and alternative name is trojan horse; derived from a mythological war between ancient Greece and the city-state Troy
The Trojans (citizens of Troy) locked themselves in their walled city and to conquer them, the Greeks manufactured a wooden horse and hid themselves inside, while those who were not able to enter went away
The Trojans opened the gate, saw the wooden horse and thought the Greeks were gone
They pulled the horse into the city for their own use and were attacked
A computer Trojan also behaves like the wooden horse in that piece of mythological history
It may look useful but will damage your computer and at other times, steal information and data in your system to compromise your web presence and finances, probably
A computer Trojan is also referred to as a scamware go here to read more http://www.computerhint/p/computer-trojan.html