"Cathodic" refers to anything related to the cathode, which is the electrode where reduction reactions occur in an electrochemical cell. In simple terms, it is the part of a circuit that receives electrons, making it essential for processes like electrolysis and battery operation. The cathode is typically marked with a negative charge in electrolytic cells and a positive charge in galvanic cells. In the context of corrosion prevention, cathodic protection is a technique used to protect metal structures, such as pipelines and ships, from rusting. This method involves applying a small electrical current to the metal, making it the cathode in a corrosion cell, thus preventing oxidation and extending the lifespan of the metal.