An Overview of Application of Internet of Things (IoT) in Various Fields: Emerging Challenges and Prospects

The Internet of Things (IoT) has emerged as one of the most transformative technological models of the twenty-first century, enabling the unified interconnection of billions of physical objects with digital infrastructure. This study systematically examines the applications of IoT across many fields that include healthcare, agriculture, smart cities, Industry 4.0 and smart homes. This review covers the benefits of IoT deployment in each sector, critically analyzes the persistent technical, security and socioeconomic challenges that hinder broader adoption and identifies convergence trends with artificial intelligence (AI), blockchain, edge computing, 5G connectivity, etc. This study reveals that although IoT holds substantial promise for improving system operational efficiency, resource management and quality of life, significant barriers, such as cybersecurity vulnerabilities, interoperability deficits, privacy infringements and infrastructure costs needs attention prior to realizing the full potential of the technology. This review covers future research scope and policy recommendations for effective IoT deployment.