Coastal lagoons are parts of the Earth’s coastline, where the ocean meets the land. They are important zones both for living things and for our economy. Coastal lagoons contain various kinds of habitats that provide homes for many animals and plants. Thus, they provide many valuable natural resources to people living and working in those areas. In this article, we describe what makes coastal lagoons attractive and important to plants, animals, and people. We also give examples of human activities and pressures that disrupt the lagoons close to where people live. Despite the damage human activities can cause to coastal lagoons, if countries respond with the right management measures, we have hope that the condition of coastal lagoons can improve, so that they will exist long into the future.