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Botnet is a jargon term for a collection fo software robots, or bots, that run autonomously and automatically.

Hi-tech criminals use botnets to send out spam . It was found in the US that "More than 2.2 million US PCs were found to be part of botnets, networks of hijacked home computers, in the first six months of 2010"

This article discusses the US ad South Korean research into suspected cyber attacks from North Korea on private and govt websites in the two countries. It discusses the programs used, the impacts and effects and how the attack takes place from one computer, creates a network through botnets and installs malware into thousands of computers which then send repeated requests, simultaneously to the same website, attacking it.