Salt dome storage is a method used to store large quantities of natural gas, oil, and other materials in underground salt formations. These formations are created when ancient seas evaporate, leaving behind thick layers of salt. The salt is impermeable, which means it prevents the stored materials from leaking into the surrounding environment. The process involves drilling wells into the salt dome to create caverns. These caverns can be filled with gas or liquid, providing a safe and efficient way to store energy resources. This method is popular because it offers a reliable solution for managing supply and demand fluctuations in the energy market.