Geographically, a caldera represents a “destructive” volcanic landform. When a massive volume of magma is erupted quickly, the structural support for the mountain top vanishes, causing it to cave inward. This creates a basin much larger than the original vent. Famous examples include the Yellowstone Caldera and Santorini in Greece. In competitive exams, calderas are distinguished from “Craters” by their size and the specific process of collapse. They are significant in physical geography as indicators of super-volcanic activity and often host unique geothermal features like hot springs and geysers.