Impedance spectroscopy has firmly established itself as one of the most informative and irreplaceable investigative methods in physical chemistry, electrochemistry, and physics, particularly in the areas of semiconductors, solid electrolytes, corrosion, solid state devices, and electrochemcial power sources. This book enables understanding of impedance spectroscopy in general and gives detailed guidance to its application in various areas. It covers all the subjects needed by a researcher in order to decide whether impedance spectroscopy is useful for a given experiment. It includes theoretical considerations for modeling as well as information on actually applying the technique.