What is a virus?
is a program written with malicious intent and sent out by attackers. The virus is transferred to another computer through e-mail, file transfers, and instant messaging. The virus hides by attaching itself to a file on the computer. When the file is accessed, the virus executes and infects the computer. A virus has the potential to corrupt or even delete files on your computer, use your e-mail to spread itself to other computers, or even erase your entire hard drive.Some viruses can be exceptionally dangerous. The most damaging type of virus is used to record keystrokes. These viruses can be used by attackers to harvest sensitive information, such as passwords and credit card numbers. Viruses may even alter or destroy information on a computer. Stealth viruses can infect a computer and lay dormant until summoned by the attacker.