A Computer Virus is a small program designed to cause some kind of damage in the infected computer, eitheir deleting data, either capturing information, either by altering the normal operation of the machine.
Like the human virus has different levels of gravity, such as the Ebola virus and the influenza virus, the computer virus range from slightly disturbing to totally destructive. A real virus does not spread without human action, we need to send someone a file or send email to it from spreading. The virus can be disguised as attachments of image. audio and video.