A casino operator runs the site and offers games to players. A slot provider...

https://wiki-byte.win/index.php/How_Do_Casinos_Mix_Games_From_Multiple_Providers_in_One_Catalogue%3F

A casino operator runs the site and offers games to players. A slot provider makes the game. Provider names in a catalogue help identify who created each title. Artwork and sound may differ, but they do not change the game rules.