What is a computer virus???

What is a Computer Virus?

A computer virus is a program which reproduces itself. It may attach to other programs, it may create copies of itself (as in companion viruses). It may damage or corrupt data, change data, or degrade the performance of your system by utilizing resources such as memory or disk space. 


A computer virus may be categorized with one or more of the following four designations:
Boot sector computer virus 
Master Boot Record (MBR) computer virus 
File infector computer virus 
Macro computer virus 

A computer virus which displays characteristics of more than one of these categories is known as a multi-partite computer virus.