Sensors are objects that are used to detect events or changes which occur in the surrounding environment. It helps in converting real world information into data that computers can understand. They can be objects that are used on a daily basis, such as touch-sensitive elevator buttons, flow measurement devices, etc. Some widely used types of sensors are biosensors, chemical sensors, nanosensors, etc. This book is an essential guide for both academicians and those who want to develop a better understanding of the subject matter. In this book, using case studies and examples, constant effort has been made to make the understanding of the concepts of sensor systems as easy and informative as possible.