Popular gambling machines, or slots, can be found all over the world in casinos, taverns, dining establishments, and other entertainment venues. In order to play, players must insert cash or tokens,win 101 ludo turn on the machine, and watch the reels spin. Payouts are awarded for winning combinations of symbols on the reels. Slot machine technology has advanced significantly since it was first developed in the late 19th century. Gears and levers were used in the early mechanical models. With random number generators (RNGs) used to determine spin outcomes, most modern slot machines are electronic.