Galvanic protection, also known as cathodic protection, is a technique used to prevent corrosion in metal structures. It works by using a sacrificial anode, typically made of a more reactive metal, which corrodes instead of the protected metal. This method is commonly applied to pipelines, ships, and underground tanks to extend their lifespan. The system relies on the principle of electrochemistry, where the sacrificial anode is connected to the metal structure. When the two metals are in contact with an electrolyte, such as water or soil, the anode corrodes, thereby protecting the metal structure from rust and degradation.