Tsunamis are one of the most destructive natural phenomena in the world. Literally, the word “tsunami” comes from Japanese, meaning “harbor wave.” Tsunamis are often caused by earthquakes that occur on the sea floor, volcanic eruptions, or underwater landslides. Tsunami waves can reach speeds of up to 800 km/h in the deep sea, and when they approach the coast, they can grow very high and destroy everything in their path. The process of causing a tsunami begins with a shift in tectonic plates. When these plates move, the accumulated energy can cause large earthquakes. The waves formed by this shift do not appear high in deep water, but as they approach the coast and the sea depth decreases, the waves compress and become very high, often referred to as “killer waves.” Tsunamis have amazing speed, but their prediction is very difficult. Many countries, especially those on the Pacific Ring of Fire, have developed sophisticated early warning systems. This system uses a network of sensors and satellites to detect earthquakes and unusual sea water movements. This early warning is very important to help local communities take quick evacuation steps. Tsunami waves can not only continue in one wave; they often come repeatedly in a series of waves called a “multi-surge.” This means that while the first wave may not cause major damage, subsequent waves can have a more devastating impact. Therefore, it is important for people living in tsunami-prone areas to remain alert even though the first wave has receded. History records some of the most destructive tsunamis in human history. One of the most memorable is the 2004 Indian Ocean Tsunami, which was generated by a megathrust earthquake with a magnitude of 9.1-9.3 on the Richter scale. This tsunami killed more than 230,000 people in several countries, including Indonesia, Thailand and Sri Lanka. The infrastructure damage and social impacts left behind by this tsunami were extraordinary. In Indonesia, which is located in an earthquake and tsunami prone zone, public education is very important. Educational programs and evacuation drills implemented by the government and non-government organizations have helped increase public awareness and preparedness. The construction of tsunami-resistant infrastructure, such as multi-storey buildings in coastal areas, is also being introduced to reduce the risk of damage. In the face of the real risk of tsunamis, technology and research continue to develop. Scientists can now use computer models to analyze potential tsunami impacts and formulate mitigation strategies. Although there is no way to stop a tsunami, preparedness and education can significantly reduce the number of fatalities and losses. The impact of a tsunami is not only physical; The psychological aspect is also very significant. Many survivors experience long-lasting trauma, and psychological support is an important component in their recovery. Communities, governments and international organizations are working together to help rehabilitate affected areas and provide support to victims. The threat of tsunamis continues to be a warning to coastal communities around the world. Through improved technology, ongoing education, and efficient early warning systems, there continues to be hope for reducing the impact and number of victims. Given the ever-changing environment, awareness of this natural phenomenon is becoming increasingly important in facing the challenges offered by tsunamis.