As you see above, speculative fiction can be further split into categories of Science Fiction and Fantasy (and Horror, as well). This can be a fuzzy distinction; for example, some might argue that Star Wars is science fiction because it takes place in space and involves robots and lot of advanced technology. Most, though, consider Star Wars to be fantasy.
These genre distinctions are further complicated by differences in usage. For example, some people use "science fiction" to refer to the umbrella category of "speculative fiction," meaning that fantasy and horror should be considered sub-genres of sci-fi. Others consider "speculative fiction" to be a genre of its own, distinct from science fiction. Writers often resist being categorized by any of these terms because they fear being classified as a "genre writer," which makes it difficult for them to market their work to wider audiences. The article below explores the fluid nature of these genre definitions in depth.

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