A steam engine is a heat engine that performs mechanical work using steam as its working fluid. It was an essential part of industrialization during the Industrial Revolution.
James Watt: An inventor who significantly improved the efficiency of the steam engine by adding a separate condenser.
Locomotive: A powered rail vehicle used for pulling trains which often uses a steam engine for power.
Industrialization: The process by which an economy is transformed from primarily agricultural to one based on manufacturing goods.