The Greatest Fiction by Genre
A genre is really just a kind of something. When that something is fictional literature, a genre is a kind of fiction. It indicates any of the categories a work of fiction can be placed into. Usually readers and book sellers use the term "genre" for fiction more narrowly focused on specific elements of literature than fiction in general.
A story in the mystery genre is expected to focus on the solving of a mystery. A narrative in the science fiction genre usually (but not always) speculates on effects of science and technology. A work of horror fiction presents material intended to horrify the reader. And so on.
Fictional genres can be further divided into subgenres that tighten the focus further. So a science fiction novel speculating on a dismal future is classed in the dystopian subgenre. One that speculates on what the world might be like if past events had happened differently is placed in the alternative history subgenre.
Note also, these genres and subgenres can overlap, so you may find a title on multiple lists.
So far, Greatest lists have been created under the following categories:
Adventure
• Adventure Fiction—the greatest major works of fictional adventure literature.
Alternative History
• Alternative History Literature—the greatest major works of alternate or alternative history literature.
Crime and Mystery
• Crime and Mystery Literature—the greatest major works of crime, detective or mystery fiction.
• Crime and Mystery Series—the greatest series of crime, detective or mystery fiction.
• Crime and Mystery Stories—the greatest short stories of crime, detection or mystery fiction.
Fantasy
• Fantasy Literature—the greatest major works of fantasy fiction literature.
• Fantasy Series—the greatest series of fantasy fiction literature.
• Fantasy Stories—the greatest short stories of fantasy fiction literature.
Historical Fiction
• Historical Fiction—the greatest major works of historical fiction literature.
• Historical Fiction Series—the greatest series of historical fiction literature.
Horror
• Horror Literature—the greatest major works of horror fiction literature.
• Horror Stories—the greatest short stories of horror fiction literature.
Humour and Satire
• Humour and Satire—the greatest major works of humorous and satirical literature.
Literary Fiction
• Literary Fiction—the greatest major works of literary fiction.
Philosophical Fiction
• Philosophical Fiction—the greatest major works of philosophical fiction literature.
Romance
• Romance Literature—the greatest major works of romantic fictional literature.
Science Fiction
• Science Fiction—the greatest major works of speculative or science fiction.
• Science Fiction Series—the greatest series of speculative or science fiction.
• Science Fiction Stories—the greatest short stories of speculative or science fiction.
Thrillers
• Thrillers—the greatest major works of intrigue, suspense and other thrilling fiction.
More genres and subgenres to come.

