RTP is a game’s long-run average return; the house edge is the share it keeps....

https://enyenimp3indir.net/what-does-expected-value-mean-in-casino-games-in-plain-english/

RTP is a game’s long-run average return; the house edge is the share it keeps. At 96% RTP, the house edge is 4%. Volatility shapes the swings, but short sessions can land far from the average in either direction.