Cathodic protection is an effective method used to prevent metal corrosion by converting the metal surface into the cathode of an electrochemical cell. This corrosion prevention technique works by attaching a sacrificial metal, such as zinc or magnesium, which serves as the anode and corrodes instead of the protected metal surface. Usually, a simple electric system is used to supply a protective current that keeps the metal safe from corrosion. Commonly applied to pipelines, ship hulls, and steel structures, cathodic protection ensures long-lasting corrosion resistance and structural integrity.