What is steam power made from?

Steam power could be described as pressure. Water heated above the boiling point turns to steam and the molecules move very rapidly and want to separate. If the water is in an enclosed area, the pressure will increase. This pressure can be used to move components of an engine that generates electricity. Generally, steam power is used to generate electricity or in the case of old railroad engines, it was used to actually push the train forward. Generally steam power isn't very efficient because you need an extreme source of heat to bring the water to boiling.