What is the most harmful type of computer system virus?

The most hazardous type of computer virus is a Trojan horse.  https://islamhood.org/?p=2045 This kind of virus is created to trick the user into thinking it is a harmless program or file. When the user runs the program, the infection is installed and can begin causing damage. Trojans can delete files, take personal details, and even take control of your computer system.