Practical IoT: A Comprehensive Hands-On Guide to Building Connected Systems is an in-depth resource for understanding and implementing Internet of Things (IoT) technologies. Spanning 20 comprehensive chapters, the book begins with an introduction to IoT concepts, its evolution, and its ecosystem, moving into applications across smart cities, healthcare, industrial automation, and environmental monitoring. It delves into IoT architectures, hardware components, and connectivity protocols, highlighting key technologies like sensors, microcontrollers, and communication frameworks.The book provides hands-on guidance with platforms such as Arduino and Raspberry Pi, enabling readers to build real-world IoT projects. Advanced topics include IoT data acquisition, communication, edge computing, analytics, and integration with AI and machine learning for predictive insights. It addresses critical issues like security, privacy, and lifecycle management, ensuring robust and scalable systems. With practical examples, best practices, and a focus on industry trends, this book is ideal for students, engineers, and professionals looking to master IoT.