A Remote Access Trojan (RAT) is a type of malicious software that allows an attacker to remotely control a computer or network. A RAT is often hidden within seemingly legitimate software and can be used to steal sensitive information, install additional malware, or perform other harmful actions on the infected device. RATs are often used in cyber-espionage and cyber-crime. The use of RATs is illegal and can cause significant harm to individuals and organizations. It is important to take steps to protect your devices and networks from RATs and other types of malware, such as using a trusted antivirus program, keeping software up-to-date, and avoiding downloading or opening suspicious attachments or links.