When you play slots online, RTP shows you the average percentage of your bet...

https://fun-wiki.win/index.php/Why_Do_Slot_Bonuses_Have_Wagering_Requirements%3F

When you play slots online, RTP shows you the average percentage of your bet that’ll come back over time. Pair that with volatility, which tells you how often and how big the wins are, and you get a clearer picture of what to expect