When picking an online slot, RTP tells you the average payout over time,...

https://www.wall-bookmarkings.win/when-you-play-online-slots-understanding-rtp-and-volatility-helps-you-predict

When picking an online slot, RTP tells you the average payout over time, usually around 95-97%. Volatility shows how often and how big those wins might be, so low means frequent small wins, high means rare but bigger hits