A sacrificial anode is a metal component used to protect other metal structures from corrosion. It is typically made of a more reactive metal, such as zinc, magnesium, or aluminum. When placed in contact with a less reactive metal, the sacrificial anode corrodes instead, effectively "sacrificing" itself to preserve the integrity of the protected metal. This method is commonly used in various applications, including marine environments, where ships and underwater structures are at risk of corrosion. By attaching sacrificial anodes to these structures, they can extend their lifespan and reduce maintenance costs associated with corrosion damage.