An oceanic island, also known as a volcanic island, is a type of island formed by volcanic activity on the ocean floor. There are several synonyms for the term "oceanic island," including seamounts, guyots, and tablemounts. Seamounts are underwater mountains that rise up from the ocean floor, while guyots are flattened seamounts that have eroded over time. Tablemounts, also known as mesas, are flat-topped mountains that rise above the sea level. Other synonyms for oceanic islands include volcanic islands, island arcs, hotspot islands, and mid-ocean ridge islands. Despite their different names, these islands share a common origin and provide unique habitats for a range of plant and animal species.