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

https://marcossmartchat.image-perth.org/why-do-some-sessions-end-up-way-above-rtp-and-others-way-below

RTP describes the share a game is designed to return over time; the house edge is the share it retains. A 96% RTP means a 4% house edge