A computer threat is a malicious program or code that can cause harm to a computer system. The two most common types of computer threats are Trojans and viruses. A Trojan is a type of malicious software that disguises itself as legitimate software in order to gain access to a computer system. It can then be used to steal data, delete files, or even take control of the system. A VIRUS is a type of malicious code that replicates itself and spreads from one computer to another. It can cause damage to a computer system by corrupting or deleting files, or by using the system's resources for malicious purposes. Both Trojans and viruses can be used to launch cyber attacks and can have serious consequences for individuals and organizations.