The article provides a comprehensive overview of the Internet of Things (IoT), its vision, applications, and research challenges. IoT is described as an extension of the Internet and Web into the physical realm, enabling the integration of digital and physical entities through various technologies such as RFID, sensors, and actuators. The authors highlight the need for a holistic perspective on IoT, addressing both the technical and societal aspects of its development. Key concepts include the identification, communication, and interaction of smart objects, which form the basis for new applications and services. The article discusses the research context, including enabling technologies like wireless sensor networks and RFID, and the challenges in areas such as distributed systems, data confidentiality, and security. It emphasizes the importance of addressing these challenges to ensure the successful adoption and widespread deployment of IoT technologies.The article provides a comprehensive overview of the Internet of Things (IoT), its vision, applications, and research challenges. IoT is described as an extension of the Internet and Web into the physical realm, enabling the integration of digital and physical entities through various technologies such as RFID, sensors, and actuators. The authors highlight the need for a holistic perspective on IoT, addressing both the technical and societal aspects of its development. Key concepts include the identification, communication, and interaction of smart objects, which form the basis for new applications and services. The article discusses the research context, including enabling technologies like wireless sensor networks and RFID, and the challenges in areas such as distributed systems, data confidentiality, and security. It emphasizes the importance of addressing these challenges to ensure the successful adoption and widespread deployment of IoT technologies.