RTP is the long-run share a game is designed to return; the house edge is the...

https://www.insert-bookmark.win/rtp-describes-long-run-returns-96-rtp-means-a-4-house-edge-not-a-promise

RTP is the long-run share a game is designed to return; the house edge is the remainder. A 96% RTP means a 4% house edge, not a guaranteed loss of 4% per session. Volatility shapes how wins and losses arrive, and short-run results can vary sharply.