How Are Computer Viruses Spread Across The Internet?

Computer viruses spread over the internet via many different ways. When people download or share a file which is infected, it is likely that the virus which is there with the file will hamper the proper functioning of the computer.

Viruses also spread when people download attachments from e-mails. Quite a few web-sites also contain viruses, hence when people visit these web-sites the viruses get transferred to their computer. A computer virus basically is a computer program which can replicate itself and infect a computer without the consent or knowledge of the user. Viruses usually spread quickly over a network by infecting files on a network file system.

Viruses are often mixed up with computer worms and Trojan horses. Now day's viruses mainly use network based services like World Wide Web, e-mail or file sharing system to spread.