Nikola Tesla's groundbreaking invention of alternating current (AC) power revolutionized the way electricity is distributed and utilized. Unlike direct current (DC), AC allowed for efficient transmission over long distances, spurring the development of electrical grids and enabling the widespread electrification of homes and industries. Tesla's AC power system triumphed in the "War of Currents," demonstrating its superiority over Edison's DC system and forming the basis of modern electrical infrastructure.