Electrochemistry is one of the oldest and, not least due to its applications in energy technology, one of the most current fields of physical chemistry. As a truly interdisciplinary science, it shares many aspects with surface science and the physical chemistry of solids and liquids. This volume provides an introduction to the structures and processes at metal and semiconductor electrodes, taking into account the results of recent structural investigations as well as older thermodynamic and kinetic aspects. This modern presentation is complemented by chapters on the phase boundary between two liquids and the fundamentals of electrochemical measurement methods. TOC: Introduction - Electrolyte Solutions - The Electrode Potential - The Metal-Electrolyte Phase Boundary - Adsorption at Metal Electrodes - Phenomenological Treatment of Electrochemistry.