While Thomas Newcomen invented a steam pump in 1712, James Watt’s 1776 improvement—adding a separate condenser—transformed the steam engine into a practical power source for industry. This invention allowed engines to work continuously without losing heat, making them significantly more efficient. The steam engine liberated factories from their dependence on water power, allowing them to be built anywhere. It soon powered locomotives and steamships, revolutionizing global transportation and trade. By providing the mechanical energy needed to drive large-scale machinery, the steam engine became the primary catalyst for the Industrial Revolution, fundamentally shifting human society from an agrarian economy to an industrial one.