RTP is a long-run average; house edge is the casino’s expected share of wagers:...

https://www.inter-bookmarks.win/rtp-is-a-long-run-average-not-a-promise-for-tonight-96-rtp-means-a-4-house

RTP is a long-run average; house edge is the casino’s expected share of wagers: 96% RTP means a 4% house edge. Volatility measures how uneven results can be. Over a short session, wins or losses may differ sharply from the average.