A large group of infected computers, controlled without the user's knowledge, to perform tasks such as sending spam is called; botnet
To answer this question, we need to first define an internet bot. An Internet bot is simply defined as a software application that runs tasks in an automated manner over the Internet.
Now, a number of connected internet devices that run one or more bots is referred to as a botnet and this botnet tends to control tasks on the infected computers without the user's knowledge.
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