When you play online slots, the RTP tells you the average return you can expect...

https://www.pfdbookmark.win/online-game-mechanics-often-boil-down-to-rtp-and-volatility-which-tell-you-how

When you play online slots, the RTP tells you the average return you can expect over time, usually around 95% to 98%. Volatility shows how often and how big the wins might be—low means frequent smaller wins, high means rare but bigger payouts