RTP stands for Return to Player and refers to the theoretical payout percentage rate of a slot machine. It is the average amount of money that a slot pays back to the players over a long period of time, usually expressed as a percentage. For example, if a slot machine has a 90% RTP rate, it means that, for every $100 wagered, it pays $90 back out to players. The higher the RTP, the better the chances of winning. RTP is a theoretical concept meant to guide players in choosing a slot machine they have a good chance of winning. The RTP of a slot machine can be found in the games information or help section, online reviews, or from the slot game providers website.