The term 'steam engine' refers to a type of engine that uses steam as its power source. A steam engine is typically composed of a boiler, a cylinder, and a piston. The boiler produces steam, which is then directed into the cylinder, where it pushes the piston back and forth. This motion is used to power machinery. A turbine is a device that converts the energy of a fluid into mechanical energy. It consists of a set of blades mounted on a shaft, which is rotated by the force of the fluid. Turbines are commonly used in steam engines to convert the energy of the steam into mechanical energy.