An estuary is a coastal area where freshwater from rivers and streams meets and mixes with saltwater from the ocean. This unique environment is characterized by its brackish water, which supports a diverse range of plant and animal life. Estuaries serve as crucial habitats for many species, including fish, birds, and invertebrates, making them vital for biodiversity. Estuaries also play an important role in the ecosystem by acting as natural filters, trapping pollutants and sediments before they reach the open ocean. They provide essential services such as flood protection, water purification, and recreational opportunities for communities, highlighting their significance in both nature and human life.