The term is usually used with a instant bitcoin bot net or malicious connotation. Botnet architecture has evolved over time in an effort to evade detection and disruption. Many recent botnets now rely on existing peer-to-peer networks to communicate. Typically, these botnets operate through Internet Relay Chat networks, domains, or websites.
Clients execute the commands and report their results back to the bot herder. C by the bot herder. Each client retrieves the commands and executes them. Clients send messages back to the IRC channel with the results of their actions.