RTP is a game’s long-run average return: 96% RTP means a 4% house edge....

https://www.active-bookmarks.win/rtp-is-a-game-s-long-run-average-return-house-edge-is-the-casino-s

RTP is a game’s long-run average return: 96% RTP means a 4% house edge. Volatility describes how uneven wins and losses may be. In a short session, results can differ sharply from the average—there’s no guaranteed return.