This chapter focused on providing the latest knowledge about IoT with prominence on application issues, intelligent sensors, enabling technologies, communication technology, and protocols. This chapter explores the interconnection among cloud computing, the internet of things (IoT), and machine learning. It delves into how integrating these technologies can enable intelligent and data-driven applications in various domains for smart cities. It also describes the challenges and opportunities presented by combining cloud computing, IoT, and machine learning and highlights the novel approaches, techniques, and frameworks that leverage this convergence. The convergence of cloud computing, the internet of things (IoT), and machine learning has opened up new opportunities for creating intelligent and efficient systems.