An intentionally disruptive program that spreads from program to program or from disk to disk is known as

A computer virus is a program or piece of code that is loaded onto computer without the knowledge of the computer owner and runs against his wishes. Viruses can also replicate themselves. A simple virus that can make a copy of it over and over. Even such a simple virus is dangerous because it will quickly use all available memory and bring the system to a halt. An even more dangerous type of virus is one capable of transmitting itself across networks and bypassing security systems.