When you spin an online slot, the RTP tells you the average payout you can...

https://www.list-bookmarks.win/online-game-mechanics-boil-down-to-how-fair-and-fun-your-experience-really-is

When you spin an online slot, the RTP tells you the average payout you can expect over time—usually expressed as a percentage. Volatility shows how often and how big those wins might be, from steady small hits to rare big jackpots