When you jump into an online slot, the RTP tells you how much you can expect...

https://direct-wiki.win/index.php/What_Should_I_Check_Before_Signing_Up_to_a_Casino%3F

When you jump into an online slot, the RTP tells you how much you can expect back over time—usually around 95% to 98%. Volatility shows if wins come big and rare or small and steady