A correct answer is malicious programs are often disguised as legitimate software. Computer viruses are unwanted software programs or pieces of code that interfere with the functioning of the computer. They a self-replicating computer program that interferes with the functioning of the computer by infecting files, data, programs, etc. Trojan HorseA Trojan is sometimes called a Trojan virus or a Trojan horse virus, but thats a misnomer. Viruses can execute and replicate themselves but Trojan cannot. A user has to execute Trojans. It can't replicate like viruses and worms as a Trojan horse hides in a program. it is a type of malicious code or software that looks legitimate and acts as a bona fide application or file Once installed, Once you install any such program, the trojan horse enters your computer. It can provide unauthorized access to your computer, send your files to other computers, and may delete files or can make other unwanted changes in your computer by gathering information by monitoring. Trojan malware example to show how it works. You might think youve received an email from someone you know and click on what looks like a legitimate attachment. But youve been fooled. The email is from a cybercriminal, and the file you clicked on €” and downloaded and opened €” has gone on to install malware on your device. When you execute the program, the malware can spread to other files and damage your computerCommon Types Of Computer Viruses are·-Trojan virus, File-infecting Virus, Macro Virus, Web Scripting Virus, Boot Sector Virus, etc