If interested in the Internet of Things (IoT), you are in the right place. This book is designed to be a basic source for the fundamentals of IoT that you need to know to start your journey. It starts with a basic understanding of the terms and definitions and we move forward into different things. I call it things because you may call them IoT technologies, you may call them IoT protocols, or even IoT standards. This book will explain different ways that things can talk to each other and communicate with each other. For example, medical wearable devices; what kind of data they generate, how they transmit them, what technology and what kind of signal they use, and what are the potentials and what are the challenges. Whenever possible, the theoretical concepts are linked with laboratory experiments.