We're not talking about a wooden horse. In other words, the Trojan horse is a virus that is very destructive to your computer. It is usually hidden as a very simple program. Usually, you have Trojan horses that think you are installing the application in question. But it ends up with a harmful add-on to your computer.
Some Trojan horses allow other viruses to easily access your computer. Others have more detailed functions. For example, the remote access Trojan allows the virus inventor to access the computer and select options after it is installed on the computer.
Some are designed to disable or completely kill yours