Electrochemistry is a field of physical science that studies the relationship between chemical energy and electrical energy. It is fundamentally concerned with chemical reactions that involve the transfer of electrons, known as redox reactions. These reactions occur when suitable electrical potentials are applied, allowing electrochemical cells to generate electrical current or conversely, using an electrical current to drive a chemical change. Major applications include the design of batteries and fuel cells, which convert chemical potential energy into storable electricity, as well as industrial processes such as electroplating, which uses electrical deposition to coat surfaces, and the study of corrosion, which is an electrochemical degradation process.