Computer infection is a term used to describe malicious software that can damage or disrupt the normal functioning of a computer system. A VIRUS is one type of computer infection, which is a program that can replicate itself and spread to other computers. Viruses can cause a variety of problems, such as corrupting data, slowing down computer performance, and even deleting files. It is important to protect your computer from viruses by using antivirus software and regularly updating your operating system.