What is a kind of engine that uses water steam or heat?

A steam engine is a type of engine that uses water steam to generate power. It operates by heating water in a boiler to produce steam, which then expands and moves pistons or drives turbines to perform mechanical work. Steam engines were pivotal during the Industrial Revolution, powering locomotives and machinery. Modern applications have largely shifted to more efficient engines, but steam technology still finds use in some power plants and historical restorations.