Science fiction (abbreviated SF or sci-fi with capricious punctuation and capitalization) is a ample brand of fiction that generally involves speculations based on accepted or approaching science or technology. Science fiction is begin in books, art, television, films, games, theatre, and added media. In authoritative or business contexts, science fiction can be alike with the broader analogue of abstract fiction, encompassing artistic works accumulation artistic elements not begin in abreast reality; this includes fantasy, horror, and accompanying genres.

Science fiction differs from fantasy in that, aural the ambience of the story, its abstract elements are abundantly accessible aural scientifically accustomed or scientifically accepted laws of attributes (though some elements in a adventure ability still be authentic artistic speculation). Exploring the after-effects of such differences is the acceptable purpose of science fiction, authoritative it a "literature of ideas". Science fiction is abundantly based on autograph entertainingly and rationally about alternating possibilities in settings that are adverse to accepted reality.

These may include:

A ambience in the future, in another time lines, or in a actual accomplished that contradicts accepted facts of history or the archeological record.

A ambience in alien space, on added worlds, or involving aliens

Stories that absorb technology or accurate attempt that belie accepted laws of nature.

Stories that absorb analysis or appliance of new accurate principles, such as time biking or psionics, or new technology, such as nanotechnology, faster-than-light biking or robots, or of new and altered political or amusing systems (e.g. a dystopia).