There are three types of volcanoes: active volcanoes that are currently erupting or can erupt again, dormant volcanoes that are not currently erupting but could in the future, and extinct volcanoes that cannot erupt again. Examples are provided for each type, including Kilauea as the most active volcano in Hawaii, Mount Fuji as a dormant volcano in Japan, and Vesuvius, which had a deadly eruption in the past that buried the city of Pompeii.