What Does Role-Playing Game (RPG) Mean?

A role-playing game (RPG) is a genre of video game where the gamer controls a fictional character (or characters) that undertakes a quest in an imaginary world.

Techopedia Explains Role-Playing Game (RPG)

RPG video games originate from tabletop or pen-and-paper RPGs, such as Rolemaster or Dungeons & Dragons (D&D) — a type of game in which the players impersonate their characters by actively describing their actions and thoughts.