Waves are the most familiar features of the ocean. Waves of all sizes endlessly roll onto our beaches. There are different kinds of ocean waves: the tides (true tidal waves) caused by the gravitational pull of the sun and moon; wind waves created by the wind; and tsunamis (sometimes incorrectly called tidal waves) caused by disturbances, such as earthquakes, volcanic eruptions, or landslides. Surrounded by the ocean, Hawai‘i is a natural setting for understanding waves.