What is DDoS (Distributed Denial of Service) attack. Google Image Result for. Botnet. A botnet is a collection of Internet-connected programs communicating with other similar programs in order to perform tasks. This can be as mundane as keeping control of an Internet Relay Chat (IRC) channel, or it could be used to send spam email or participate in distributed denial-of-service attacks. The word botnet is a combination of the words robot and network. The term is usually used with a negative or malicious connotation. Legal botnets[edit] The term botnet is widely used when several IRC bots have been linked and may possibly set channel modes on other bots and users while keeping IRC channels free from unwanted users. Illegal botnets[edit] Botnets sometimes compromise computers whose security defenses have been breached and control conceded to a third party. Recruitment[edit] The first botnet was first acknowledged and exposed by Earthlink during a lawsuit with notorious spammer Khan C.
Organization[edit] To thwart detection, some botnets are scaling back in size. See also[edit] What Are Botnets?
Understanding Botnets - Black Hat Europe 2012.