Cathodic reactions occur at the cathode during electrochemical processes, where reduction takes place. In these reactions, electrons are gained by species in the electrolyte, leading to a decrease in oxidation state. Common examples include the reduction of metal ions to solid metal or the reduction of hydrogen ions to form hydrogen gas. These reactions are essential in various applications, such as in batteries and electroplating. In a galvanic cell, for instance, the cathodic reaction helps generate electrical energy by converting chemical energy. Understanding cathodic reactions is crucial for improving the efficiency of electrochemical systems and preventing corrosion.