Botnet (also zombies)
Security
A collection of computers subject to centralized remote control by an outside party, usually without the knowledge of the owners, using surreptitiously installed software robots. The robots are spread by trojan horses and viruses. The botnets can be used to launch denial-of-service attacks and transmit spam.
- — IIP Digital Glossary of Key Cybersecurity Terms retrieved 2014-05-28