Full form of VIRUS....!!

Virus – Vital Information Resources Under Seize

A computer virus is a computer program that can replicate itself and spread from one computer to another without your knowledge and runs against your wishes. All computer viruses are man-made. They insert themselves into host programs and propagate when the infected program gets executed..

Effects of Virus :-

=-> It can quickly use all available memory and bring the system to a halt.
=-> It can result in Modification of data
=-> It can erase your complete Hard drive
=-> It can show annoying messages on your computer screen.

Virus is actually a Malware like other malwares, which include -

=-> Computer worms
=-> Trojan horse
=-> Spyware
=-> Zombies