Computer Virus

A program which is written to cause problem in the computer in known as computer virus. Due to virus data may be corrupted or lost. A virus is commonly transferred through computer to computer on floppy disk or over a telephone link. Virus can be stop by using special anti-virus software.
A program that attempts to spread from computer to computer and either cause damage or annoy users by printing messages or altering what is displayed on the screen. When a program is inserted into another program then it is known as a computer is attacked by virus. It replicates itself and spread to another computer through floppy, mail and shared media. When the user run the infected program then it get chance to replicates itself.
Computer virus does not allows computer to run smoothly. Frequently computer hangs. It can also infect disk by attaching themselves to special programs in area of your disk called boot records and master boot records. Due to the virus computer may not boot and the size of the files changed automatically. Some of the names of computer virus are: C-Brain, Macmag Stores, Cascade, Jerusalem, Internet, Patch COM, Bomb, Macro virus etc.