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Bots are software that perform automated online tasks, such as web crawling. A botnet is a network or group of computers that run such software. Often bots and botnets can be used for nefarious purposes, such as click fraud, spreading viruses, or enabling fake ad impressions.

James Green, CEO of Search Retargeting Firm Magnetic on Bots:

What’s a botnet? It’s a combination of two words: robot plus network. The "robot" bit is code that resides on your computer to do something, and the "network" bit means that there are lots of them out there (thousands or more) and they are all coordinating to do the same thing.

Continue reading at AdAge.com