The Mirai botnet, which exploited security vulnerabilities in numerous IoT devices, launched significant DDoS attacks against Dyn in October 2016, impacting thousands of businesses and millions of users. This incident highlighted the urgent need for better security practices as the number of IoT devices continues to grow, and the botnet's code was widely shared, leading to further security concerns. The presentation discusses the history, methods, and implications of the Mirai botnet, as well as recommendations for protecting against such attacks.