This report provides a comprehensive overview of botnets, detailing their architecture, operation, and the potential threats they pose to network security. It explores three variants of botnets, namely Zeus, Srizbi, and Mirai, and discusses botnet architecture, including command-and-control servers and malware distribution. The report highlights the various ways botnets operate, including voluntary and involuntary botnets, and the impact of botnets on networked applications like network security and IoT devices. It also outlines potential threats, such as DDoS attacks, and offers recommendations for organizations to protect their systems, including establishing cybersecurity teams, configuring servers and firewalls, securing sensitive devices, and implementing international frameworks. The report emphasizes the importance of strong firewalls and intrusion detection systems in mitigating botnet threats and concludes by summarizing the key aspects of botnet security and mitigation strategies.