Hydropower is a renewable energy source that generates electricity by harnessing the power of flowing water. This can be done through the use of dams, which create reservoirs of water that can be released through turbines to generate electricity. Hydropower is a reliable and clean energy source, and has been used for hundreds of years to power mills and other machinery. It is one of the oldest forms of renewable energy and is still widely used today around the world. Research in hydropower focuses on increasing efficiency, reducing environmental impacts, and exploring new technologies to further develop this important energy source.