A steam turbine is a device that converts the energy from steam into mechanical work. It operates by directing high-pressure steam onto blades attached to a rotor, causing it to spin. This spinning motion can then be used to generate electricity or power machinery. Steam turbines are commonly used in power plants, where they play a crucial role in generating electricity. They are efficient and can operate on various fuels, including coal, natural gas, and nuclear energy. Their design allows for high efficiency and reliability, making them a key component in modern energy production.