A Trojan horse is a type of malware that disguises itself as a legitimate program or file to trick users into installing it on their computers. Once installed, the Trojan horse can give attackers remote access to the computer, allowing them to steal data, spy on the user, or even take control of the machine.
Trojan horses are often used to steal financial information, such as credit card numbers and bank account passwords. They can also be used to install other malware, such as ransomware or spyware. In some cases, Trojan horses can even be used to launch denial-of-service attacks, which can take down websites or online services.