VIRUS : A small program that enters a computer without the knowledge of the users.
Viruses can be transmitted through attachments to e-mail or in a downloaded file, or be present on a removable media such as CDs, DVDs, or USB drives. Some viruses attach themselves to program files like .COM or .EXE files. When the program is loaded, the virus is loaded as well in Computer memory. Software Engineers that produce programs with large numbers of bugs are targets for viruses. To overcome this problem keeps antivirus software up to date for protection against new viruses.


