Computer Viruses: An Introduction
Your computer has probably been infected by computer viruses. But
what exactly is a computer virus?
A computer virus is a program that spreads itself by first infecting
executable files or the system areas of hard and floppy disks and
then making copies of itself. Viruses usually operate without the
knowledge or desire of the computer user, often causing harm to
the users computer system.
A more Complete
Definition of Virus
The History of
Types of Viruses