Superconductors are the materials that are used in transferring and conducting electricity without resistance. Some of the applications of superconductivity are magnetic resonance imaging, magnetic confinement fusion reactors, RF and microwave filters and nuclear magnetic resonance machines. In this book, constant effort has been made to make the understanding of the difficult concepts of superconductivity, as easy and informative as possible, for the readers. Those in search of information to further their knowledge will be greatly assisted by this book.