Science fiction

From Srafopedia

Science fiction (often called sci-fi or SF) is a popular genre of fiction in which the narrative world differs from our own present or historical reality in at least one significant way. This difference may be technological, physical, historical, sociological, philosophical, metaphysical, etc, but not magical (see Fantasy). Exploring the consequences of such differences (asking "What if...?") is the traditional purpose of science fiction, but there are also many science-fiction works in which an exotically alien setting is superimposed upon what would not otherwise be a science-fiction tale.

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Source: Wikipedia: Science Fiction