High fantasy, or epic fantasy, is a subgenre of fantasy defined by the epic nature of its setting or by the epic stature of its characters, themes, or plot. High fantasy is set in an alternative, fictional ("secondary") world, rather than the "real" or "primary" world. This secondary world is usually internally consistent, but its rules differ from those of the primary world. By contrast, low fantasy is characterized by being set on Earth, the primary or real world, or a rational and familiar fictional world with the inclusion of magical elements.

Fantasy is a genre of speculative fiction involving magical elements, typically set in a fantasy world and usually inspired by mythology or folklore. The term "fantasy" can also be used to describe a "work of this genre", usually literary.