Hydroelectric power is a form of energy that uses the movement of water to generate electricity. This process typically involves building a dam on a river, which creates a reservoir. When water is released from the reservoir, it flows through turbines, causing them to spin and produce electricity. This renewable energy source is clean and helps reduce reliance on fossil fuels. Many countries, including Brazil and Canada, rely heavily on hydroelectric power for their energy needs. It is considered one of the most efficient ways to generate electricity, as it can produce large amounts of power without emitting harmful pollutants.