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Internet of Things is a comprehensive academic textbook that presents the fundamental concepts, architectures, enabling technologies, and practical applications of IoT systems. The book explains how physical devices embedded with sensors, actuators, and communication technologies are interconnected to collect, exchange, and process data, enabling intelligent automation and real-time decision-making across diverse domains. The content is systematically organized, beginning with the evolution and core principles of IoT, followed by detailed discussions on communication protocols, system design methodologies, embedded platforms, and data analytics. It covers key technologies such as wireless communication (Wi-Fi, Bluetooth, Zigbee, LPWAN), cloud computing, edge and fog computing, big data analytics, and artificial intelligence, which collectively support scalable and efficient IoT ecosystems. The book also explores IoT architectures, including standardized models like the IoT World Forum architecture and simplified layered frameworks, explaining data flow from sensing devices to application-level services. Practical insights are provided through case studies, industrial applications, and hands-on experiments involving platforms such as Arduino and Raspberry Pi, bridging theoretical knowledge with real-world implementation. Designed for students, researchers, academicians, and engineering professionals, the book emphasizes both conceptual clarity and application-oriented learning. It also addresses critical aspects such as scalability, security, privacy, and the societal impact of IoT, preparing readers to design and develop intelligent, connected, and sustainable systems in modern digital environments.