Definition of botnet
: a network of computers that have been linked together by malware : a network of bots (see bot entry 1 sense 2b)
Criminals link hijacked personal computers together to form "botnets"—clusters of infected PCs that spammers can control from anywhere in the world.— Dave Mosher
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Merriam-Webster unabridged
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Time Traveler for botnet
The first known use of botnet was in 2003
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