Book excerpt: IoT is the biggest opportunity ever for our industry. With capabilities much greater than today's networks, opportunities beyond our imagination will appear. With IoT, we will be able to digitalize industries and realize the full potential of a networked society. The Internet of Things (IoT) is a system of interrelated computing devices, mechanical and digital machines, objects, animals or people that are provided with unique identifiers and the ability to transfer data over a network without requiring human-to-human or human-to-computer interaction. The book also looks at all the sub-systems of the Internet of Things, focusing on both the practical and theoretical issues. This text book "Internet of Things (IoT) & Its Applications" is organized into Ten Chapters. Chapter-1: Introduction to IoT for BeginnersChapter-2: Building Blocks of Internet of Things (IoT) and Their CharacteristicsChapter-3: Domain specific IoT and Their Real-world ApplicationsChapter-4: Sensor and ActuatorChapter -5: Generic Design Methodology and an IoT System ManagementChapter-6: Multiple Protocols in IoT DomainChapter-7: Common Security Measures used for Designing an IoT ApplicationsChapter-8: Python Logical Design of an IoT systemChapter -9: Laboratory Companion for Designing IoT ApplicationsChapter-10: Challenges and Future Scope of IoTSalient Features Comprehensive Coverage of Basics of IoT, Domain Specific IoT and their real world Applications, Sensor and Actuators, and Generic Design Methodology and IoT System Management. New elements in book include Multiple Protocols in IoT Domain, Python Logical Design of an IoT system, Laboratory Companion for Designing IoT Applications and Common Security Measures used for Designing an IoT Applications. Clear perception of the various project with Python Logical Design of an IoT system and illustrative diagrams. Simple Language, easy- to- understand manner.Our sincere thanks are due to all Scientists, Engineers, Authors and Publishers, whose works and text have been the source of enlightenment, inspiration and guidance to us in presenting this small book. I will appreciate any suggestions from students and faculty members alike so that we can strive to make the text book more useful in the edition to come.