Cathodic Protection is a technique used to prevent corrosion on metal surfaces, particularly those exposed to moisture or soil. It works by making the metal surface the cathode of an electrochemical cell, which reduces the oxidation process that leads to corrosion. This method is commonly applied to structures like pipelines, storage tanks, and ships. There are two main types of Cathodic Protection: sacrificial anode and impressed current. In sacrificial anode systems, a more reactive metal is attached to the structure, which corrodes instead of the protected metal. In impressed current systems, an external power source provides a continuous flow of electrical current to inhibit corrosion.