Dam construction involves building a barrier across a river or stream to hold back water, creating a reservoir. This process typically includes site selection, design, and the use of materials like concrete, earth, or rock. Dams serve various purposes, including water supply, flood control, and hydroelectric power generation. Once the design is finalized, construction begins with excavation and foundation work. Workers then build the dam structure, ensuring it can withstand water pressure and environmental conditions. After completion, the reservoir is filled, and the dam is monitored for safety and efficiency, playing a crucial role in managing water resources and energy production.