A computer virus is a computer program that has the ability to infect a computer without the user's permission, or even knowledge. There are more than few similarities between computer viruses and human viruses
biological viruse enter the body through some kind of direct contact with the body and attach themselves to a host cell. The virus spreads, and the resulting damage can in clude pain, suffering, or even death, Similarly, Computer viruses enter a host file in your computer when you open an ingected email attachment This virus then spreads, resulting in damage that cann in clude deletion of files, emailing of all the addresses in the computer's email address book. a slowing down of the system, or even fatal damage to the drive