The fundamentals and applications of magnetic sensors are encompassed in this book. It presents an overview on the research conducted in recent years in the field of magnetic sensors. The topics covered in this book vary from underlying theories and properties of magnets to their sensing applications in areas such as biomedicine, microelectromechanical systems, nano-satellites and pedestrian tracking. This book has been compiled for readers who wish to gain a basic understanding of the research domain as well as explore potential areas of applications for magnetic sensors. It also presents novel developments in this field in an efficient and legible manner.