Hydrothermal resources are natural sources of heat and steam found beneath the Earth's surface. They are primarily associated with volcanic activity and can be harnessed for various purposes, including electricity generation and direct heating applications. These resources are often found in areas with high geothermal gradients, where the temperature increases significantly with depth. The most common method of utilizing hydrothermal resources is through geothermal power plants, which convert steam or hot water into electricity. Additionally, hydrothermal systems can provide hot water for residential heating and industrial processes. Countries like Iceland and the United States have successfully developed these resources for sustainable energy production.