This document discusses security issues related to the Internet of Things (IoT). It begins with an introduction to IoT, noting the exponential growth in connected devices. It then outlines common threats to IoT systems, including attacks aimed at devices, networks, and cloud infrastructure. Specific examples like the Mirai botnet and attacks on Ukrainian power grids are examined. The presentation concludes with recommendations for improving IoT security, such as understanding system architectures, implementing policies, and regularly monitoring networks.