What is Trojan horse?

A Trojan horse is a type of malicious software that disguises itself as a legitimate program or file in order to trick users into downloading and installing it on their computer. Once installed, the Trojan horse can perform a variety of harmful actions, such as stealing sensitive information, corrupting files, or allowing unauthorized access to the infected computer. Trojans are often used by cybercriminals to gain access to a victim's computer and carry out malicious activities without their knowledge.