What is a botnet?

According to Microsoft a bot is short for robot. Criminals distribute malicious software (also known as malware) that can turn your computer into a bot (also known as a zombie). When this occurs, your computer can perform automated tasks over the Internet, without you knowing it.

Criminals typically use bots to infect large numbers of computers. These computers form a network, or a botnet.

Criminals use botnets to send out spam e-mail messages, spread viruses, attack computers and servers. If your computer becomes a part of a botnet, your computer might slow down.

For ways to help protect your computer from becoming a zombie in a botnet, go to
http://www.microsoft.com/protect/computer/viruses/zombies.mspx