A caldera is a large, bowl-shaped depression that forms after a volcanic eruption. When a volcano erupts, it can empty its magma chamber, causing the ground above to collapse. This creates a wide, often circular area that can be several kilometers in diameter. Calderas can be found in various locations around the world, including famous examples like the Yellowstone Caldera in the United States. Calderas can also fill with water, forming lakes, or become sites for new volcanic activity. Over time, they may develop unique ecosystems and landscapes. The study of calderas helps scientists understand volcanic processes and assess potential hazards related to volcanic eruptions.