The Internet of Things (IoT) has emerged as a revolutionary paradigm with a significant impact on various industries and everyday life. This paper provides a comprehensive overview of IoT basics, including its fundamental concepts, architecture and the key communication protocols that provide seamless connectivity in IoT ecosystems. Furthermore, the paper explores a wide range of IoT applications across domains such as smart healthcare, smart agriculture, smart cities, and smart homes. In addition to the IoT fundamentals and applications, this paper addresses the research challenges in the field of IoT. These challenges consist of issues related to security, privacy, scalability, energy efficiency, and interoperability. This comprehensive exploration of IoT fundamentals, protocols, applications, and research challenges, serves as a valuable resource for both beginners and experts in the field by providing insights into the IoT ecosystem and the research challenges that demand further investigation
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