Here on goodreads, it generally means that yu and another person create a plot, (Sometimes based off an already existing franchise) characters (Also sometimes already previously created) and you write the characters as though in a book. Making your characters complete the plot and any other tasks.
Why its so interesting: You only play as your specified characters, you never know what's going to happen as someone else is interacting with your character. You must take these situations and play them out, even when you don't know what they are.
Why its so interesting: You only play as your specified characters, you never know what's going to happen as someone else is interacting with your character. You must take these situations and play them out, even when you don't know what they are.