Antivirus are small software programs that should spread from one computer to a new and to interfere by means of computer operation.
A virus might.. corrupt or delete data off your computer, use your e-mail process to spread itself to help you other computers, or even erase everything on your hard disk.
Antivirus are often spread just by attachments in e-mail emails or instant messaging information. That is why it is crucial that you never open e-mail attachments unless you know who it’s from and you simply are expecting it.