Dispersion theory in mythology refers to the notion that mythology is ever-present and ever-changing. It's the idea that a story might be the same in one culture but have a different impact or meaning in another, and that stories can change depending on who they're told to and how they're told (Gerringer). Mythology has its origins and roots in far eastern countries like Greece, Rome, and Egypt, but it has also spread to western countries. The underlying evolution of separate stories over time, person, and location is described by dispersion theory.