What is a Trojan on a computer?

A Trojan is a type of malware that disguises itself as a legitimate file or program in order to trick users into downloading and installing it on their computer. Once installed, a Trojan can perform a variety of malicious activities, such as stealing sensitive information, corrupting files, or giving hackers remote access to the infected computer. Trojans are often spread through email attachments, malicious websites, or software downloads.