### Comment:
What is a botnet and how is it used in the context of malware?

### REPLY:
A botnet is a network of computers infected with malware that are used by cybercriminals to carry out illegal activities. The infected computers, known as "bots," can be used to launch large-scale attacks, such as DDoS attacks, steal sensitive information, or send out spam emails. The botnet operator can control the bots remotely and use them for their malicious purposes without the users' knowledge. The creation and operation of botnets involve sophisticated techniques, including exploiting vulnerabilities in software and social engineering tactics.