A caldera is a cauldron-like volcanic feature usually formed by the collapse of land following a volcanic eruption. They are sometimes confused with volcanic craters. The word comes from Spanish caldera, and this from Latin, meaning "cooking pot". In some texts the English term cauldron is also used.
In 1815, the German geologist Leopold von Buch visited the Las Cañadas caldera of Teide on Tenerife, and the Caldera de Taburiente on La Palma, both in the Canary Islands. When he published his memoirs he introduced the term caldera into the geological vocabulary.
Read more about Caldera: Caldera Formation, Extraterrestrial Calderas, Mineralization, List of Volcanic Calderas, Erosion Calderas