A water reservoir is a large natural or artificial lake used to store water for various purposes. These purposes can include supplying drinking water, irrigation for agriculture, and generating hydroelectric power. Reservoirs are often created by damming rivers, which allows for the controlled release of water downstream. Reservoirs play a crucial role in managing water resources, especially in areas prone to drought or seasonal fluctuations. They help maintain a steady supply of water for communities and ecosystems. Additionally, reservoirs can provide recreational opportunities, such as fishing and boating, contributing to local economies and quality of life.