Rudolf P. Huebener presents the field of superconductivity in a clear and compact manner. He vividly describes how this area has developed in many lively directions since the discovery of superconductivity over 100 years ago. This includes materials, experiments on the physical foundations, theoretical understanding, and technical applications. Among other things, it essentially addresses the Meissner-Ochsenfeld effect, magnetic flux quantization, the Josephson effect, BCS theory, and high-temperature superconductivity.