A virus cannot cause any damage to the physical devices connected to the infected computer



VIRUSES
Virus stands for vital information under siege. A virus is a destructive program that is designed to destroy the information stored in computer. It enters the system without the knowledge of the user. It enters through infected floppy or infected program or through network. It makes multiple copies of itself and causes the abnormal functioning in the system. When a virus travels through a network then it spreads to all the computers connected to the network. Virus forms its copies and place them in to the main memory. When a program is being executed by the user the virus attaches its copy to that program.


              A virus cannot cause any damage to the physical devices connected to the infected computer:-
1 It decreases the speed of the computer.
2 It erases the information stored in primary and secondary memory of the system.
3 It displays unusual messages on the screen.
4 Some powerful virus can delete the instruction in the BIOS of the Motherboard.

Types of Viruses
1 Times bound viruses
2 Trojan horses
3 Worms
4 Boot sector viruses.
5 File viruses
6 Macro viruses
7 E-mail viruses

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