Rainwater harvesting is the practice of collecting and storing rainwater that falls on rooftops or other surfaces for later use. This technique has been used for centuries as a sustainable water management strategy in areas where water is scarce or unreliable. Rainwater can be collected in tanks or cisterns and used for various purposes such as irrigation, washing, and even drinking water in some cases. Rainwater harvesting helps to reduce the demand on municipal water supplies, conserve water resources, and reduce erosion and flooding in urban areas. It is an environmentally friendly and cost-effective way to supplement traditional water sources.