A computer virus is a computer program that can copy itself and infect a computer without the permission or knowledge of the owner. The term "virus" is also commonly but erroneously used to refer to other types of malware, adware, and spyware programs that do not have the reproductive ability. A true virus can only 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, or USB 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. It attaches itself to an existing program to which may be transfer through medium that may infect other computers. Similarly, Worms are programs that can replicate itself to infect nodes but it does this with or without user intervention. Although worms has least damage but when it is ignored it may shutdown any network operations.
Here are some of the known viruses/worms that struck the world and create operation disruption among the leading establishments and companies that depends on internetworking:
> I LOVE YOU VIRUS
> CONFICKER VIRUS
> CODE RED VIRUS
> NIMDA VIRUS
Some of the hackers or cyber offenders: CLICK HERE
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