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Geysers are a unique feature found within Yellowstone National Park, which is itself a body of water and volcano located in the larger category of National Parks. Specifically, geysers are thermal features characterized by the intermittent discharge of steam and hot water into the air. They form when underground water comes into contact with magma or molten rock, causing the water to heat up and turn into steam. This pressure forces the steam and hot water out of the ground through cracks and fissures in the Earth's surface. Old Faithful is one of the most well-known geysers within Yellowstone National Park. Geysers are a fascinating and relatively rare phenomenon, making them an important part of the natural history and significance of Yellowstone National Park and the broader category of National Parks.