This book includes 07 chapters written by Dr. M. M. Tonape dealing with various aspects of superconductivity both theoretical and Experimental. Topics covered includes field induced superconductors, X-ray spectroscopy studies, Aqueous , Non aqueous and DMSO film depositions of Y-Ba-Cu alloy, Superconducting magnet technology and applications. This book covers Introduction, superconducting transitions, Meissner effect, magnetic flux, energy gap, critical currents and magnetic fields. Some basic concepts of superconductors, energy spectrum, Density of states, energy gap, DC & AC effects.