Constructed wetland is a man-made system designed to replicate natural wetlands and treat various forms of wastewater. Synonyms for constructed wetland include constructed treatment wetlands, artificial wetlands, engineered wetlands, treatment marshes, and subsurface flow wetlands. These terms refer to the same type of technology designed to remove pollutants such as nitrogen, phosphorus, and other contaminants from wastewater. Constructed wetlands provide an efficient, environmentally friendly, and cost-effective alternative to traditional wastewater treatment systems while promoting biodiversity, habitat, and aesthetic benefits. With advances in technology and research, constructed wetlands promise to play a significant role in sustainable development and ecological restoration efforts in the years to come.