A steam engine is a machine that converts the energy from steam into mechanical work. It works by heating water in a boiler until it turns into steam, which then expands and pushes against a piston or turns a wheel. This process was crucial during the Industrial Revolution, powering trains, ships, and factories, and significantly changing how goods were produced and transported. The invention of the steam engine is often credited to James Watt, who improved earlier designs in the late 18th century. His innovations made steam engines more efficient and practical, leading to widespread use in various industries. Today, while we have advanced technologies, the steam engine remains an important milestone in engineering history.