RTP describes the share a game is designed to return over time; the house edge...

https://zoom-wiki.win/index.php/How_Do_I_Explain_Variance_to_Someone_Who_Hates_Statistics%3F

RTP describes the share a game is designed to return over time; the house edge is the casino’s expected share. A 96% RTP means a 4% house edge. In a short session, results can swing sharply—past outcomes don’t guarantee what happens next.