A large wave caused by an underwater earthquake is known as a tsunami. Tsunamis are generated when there is a sudden displacement of water, often triggered by seismic activity on the ocean floor. This can happen due to earthquakes, volcanic eruptions, or landslides. Unlike regular ocean waves, tsunamis can travel across entire ocean basins at high speeds and can increase in height as they approach coastal areas, causing devastating destruction on land. Because of their immense power, tsunamis pose a significant threat to coastal communities, necessitating advance warning systems and preparedness measures.