Electrochemistry is the branch of chemistry that studies the relationship between electricity and chemical reactions. It involves the movement of electrons during chemical processes, which can occur in various systems, such as batteries, fuel cells, and electrolysis. By understanding these reactions, scientists can harness electrical energy to drive chemical changes or vice versa. In electrochemical cells, reactions occur at the electrodes, where oxidation and reduction take place. The flow of electrons from one electrode to another generates an electric current, which can be used to power devices. This field has important applications in energy storage, corrosion prevention, and the development of new materials.