Slot machines were originally entirely mechanical machines that ran on tangible parts like gears and levers. Both the payout structures and the level of gameplay complexity were constrained in these machines. However, slot machines started to undergo srummy mordenignificant change in the 1960s when electromechanical technology was introduced. This invention made it possible to incorporate more complex features and designs, like bonus rounds & multiple paylines, which raised the possibility of winnings and improved player engagement. Slot machines saw yet another major advancement with the shift to digital technology in the late 20th century. With a more dynamic and engaging experience for players, video slots became a dominant force in the gaming industry.