The document presents information about dams, including their purpose, types, uses, statistics, impacts, and conclusions. It discusses how dams are constructed barriers across rivers to contain water for various uses. The main types of dams described are gravity, buttress, arch, and embankment dams. Dams provide direct uses like water supply, irrigation, and hydroelectric power, as well as indirect uses like flood control. Statistics provided indicate over 45,000 large dams have been built globally, displacing millions of people and supporting food production. The impacts discussed are environmental, sociological like displacement, and economic. The conclusion advocates for smaller dams, careful planning and consideration of sociological impacts against economic objectives.