Botnet
Definition
A botnet is a network of malware-infected computers (bots) controlled by an attacker (botherder). Botnets are used for DDoS attacks, spam distribution, cryptomining, and data theft.
Computers become part of a botnet through malware infections, for example by opening a phishing email or visiting an infected website.
Command & Control (C2): the botherder communicates with bots via a C2 server. Modern botnets use peer-to-peer architecture to avoid detection.