With the advent of electromechanical devices in the 1930s, which included electrical components, more intricate gameplay and features like multiple paylines and bonus rounds became possible. After World War II,mbm slots slot machines became very popular, especially in Las Vegas casinos, where they were the main source of income. With the introduction of video slots in the 1970s, the gaming experience was further improved as digital screens took the place of actual reels. With their cutting-edge technology and varied themes that appeal to a broad spectrum of players, slot machines are now commonplace in casinos all over the world.