RTP is a game’s long-run return; house edge is the casino’s mathematical share:...
https://www.pure-bookmark.win/rtp-is-a-long-run-average-house-edge-is-the-casino-s-expected-share-96-rtp
RTP is a game’s long-run return; house edge is the casino’s mathematical share: 96% RTP = 4% house edge. Volatility describes how uneven results can be. In a short session, variance can swamp the average, so outcomes may differ sharply.