A computer virus is a type of malicious code or program written to alter the way a computer operates and is designed to spread from one computer to another. Once a virus has successfully attached to a program, file, or document, the virus will lie dormant until circumstances cause the computer or device to execute its code. In order for a virus to infect the computer, one has to run the infected program, which in turn causes the virus code to be executed. Viruses can be spread through email and text message attachments, Internet file downloads, and social media scam links. To avoid contact with a virus, its important to exercise caution when surfing the web, downloading files, and opening links or attachments. Hence, it is a computer program that copies itself to infect a computer without the permission/knowledge of the user.