A computer virus is a kind of program of computer which has ability to copy itself and infect a computer and programme without the permission or knowledge of the owner. A true virus has ability to spread from one computer to another (in some form of executable code) when its host is taken to the target computer; for instance because a user sent it over a network or the Internet, or carried it on a removable medium such as a floppy disk, CD,DVD, drive Viruses can increase their chances of spreading to other computers by infecting files on a network file system or a file system that is accessed by another computer. Knowingly or unknowingly virus enter into the computer and bring errors and hang the computer.
People are developing this kind of virus in order to trade software and with intention to bring difficulties and problem. People are able to sell the antivirus software to increase their income.
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