The Hero’s Journey is a narrative structure first described by Joseph Campbell in The Hero With A Thousand Faces, and later refined for modern age by Christopher Vogler in The Writer’s Journey. Campbell noticed and described patterns in our myths and stories, of the hero/heroine leaving their ordinary world to go onto adventure, and after going through trials and crises, coming back home a transformed person.
It’s a very archetypal structure that one can notice in many stories: The Lord of the Rings, Harry Potter, Star Wars, and thousands upon thousands of other works, including games. And I think why we as people are intrinsically drawn to this sort of narrative structure, is essentially because it’s about striding to a goal, facing challenges and getting to the lowest point upon the way, but eventually overcoming them and becoming a better person as a result. It’s what we encounter and go through in our daily lives, even though we might not realize it at first.