The author reviews the progress made in superconductivity research from the original discovery of superconductivity in mercury in 1911 to the present day. The BCS theory of superconductivity is discussed along with the Meissner effect that verifies and quantifies superconducting behavior. The various materials that were studied and the discoveries that resulted are elaborated. The author discusses the structure of the 95 K superconductor which is a new variation of the class of oxygen-defect-copper perovskites. The processing of these perovskites is also examined. The characteristics of the 123 structure are also described. New materials and the applications of the various materials are discussed.