High fantasy or epic fantasy is a subgenre

Genre

Genre , Greek: genos, γένος) is the term for any category of literature or other forms of art or culture, e.g. music, and in general, any type of discourse, whether written or spoken, audial or visual, based on some set of stylistic criteria. Genres are formed by conventions that change over time...

 of fantasy

Fantasy

Fantasy is a genre of fiction that commonly uses magic and other supernatural phenomena as a primary element of plot, theme, or setting. Many works within the genre take place in imaginary worlds where magic is common...

 that is set in invented or parallel worlds

Parallel universe (fiction)

A parallel universe or alternative reality is a hypothetical self-contained separate reality coexisting with one's own. A specific group of parallel universes is called a "multiverse", although this term can also be used to describe the possible parallel universes that constitute reality...

. High fantasy was brought to fruition through the work of authors such as J. R. R. Tolkien

J. R. R. Tolkien

John Ronald Reuel Tolkien, CBE was an English writer, poet, philologist, and university professor, best known as the author of the classic high fantasy works The Hobbit, The Lord of the Rings, and The Silmarillion.Tolkien was Rawlinson and Bosworth Professor of Anglo-Saxon at Pembroke College,...

 and C. S. Lewis

C. S. Lewis

Clive Staples Lewis , commonly referred to as C. S. Lewis and known to his friends and family as "Jack", was a novelist, academic, medievalist, literary critic, essayist, lay theologian and Christian apologist from Belfast, Ireland...

, whose major fantasy works were published in the 1950s. High fantasy has become one of the two genres most commonly associated with the general term fantasy, the other being sword and sorcery

Sword and sorcery

Sword and sorcery is a sub-genre of fantasy and historical fantasy, generally characterized by sword-wielding heroes engaged in exciting and violent conflicts. An element of romance is often present, as is an element of magic and the supernatural...

, which is typified by the works of Robert E. Howard

Robert E. Howard

Robert Ervin Howard was an American author who wrote pulp fiction in a diverse range of genres. Best known for his character Conan the Barbarian, he is regarded as the father of the sword and sorcery subgenre....

.
High fantasy is defined as fantasy fiction set in an alternative, entirely fictional ("secondary") world, rather than the real, or "primary" world.