This book and its offshoots were prepared to provide comprehensive information about the Internet of Things. Its goal is to introduce IoT to the bachelor students, master students, technology enthusiasts and engineers that are willing to extend their current knowledge. This book is also designated for teachers and educators willing to extend their knowledge and prepare a course on IoT technology (full or partial). We (authors) assume that persons willing to study this content do possess some general knowledge about IT technology, i.e. understand what embedded system is, know the general idea of programming and are aware of wired and wireless networking as it exists nowadays. We believe this book is constituting a comprehensive manual to the IoT technology; however, it is not a full encyclopedy nor exhausts market review. The reason for it is pretty simple – IoT is so rapidly changing technology, that new devices, ideas and implementations appear every single day. Even so, once you read this book, you will be able to quickly move over IoT environment and market, chasing ideas with ease and implementing your own IoT infrastructure. We also believe this book will help adults that took their technical education some time ago to update their knowledge. We hope this book will let you find new brilliant ideas both in your professional life as well as see a new hobby or even startup innovative business. Note: the sky is no longer the limit, so keep exploring with IoT!