When you pick an online slot, knowing its RTP and volatility can save you from...

https://www.third-bookmarks.win/when-checking-out-online-slots-it-s-smart-to-look-at-the-rtp-and-volatility

When you pick an online slot, knowing its RTP and volatility can save you from surprises. RTP tells you the average return over time, usually around 95-97%, while volatility shows how wild or calm the wins might be