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Science fiction is a genre of literature, film, theater, and other forms of expression focusing on fantastic or futuristic worlds.  

Science fiction (Sci-Fi for short) is a genre of literature, film, theater, and other forms of expression that are based on speculations about current or future science or technology.  It is notably difficult to define what is and isn't Sci-Fi as such stories can be set in the futire, present or past, and on alien worlds, alternate forms of Earth or even Earth as it is or was historically. Even defining Sci-Fi as being a medium that contains at its core scientific or technological concepts that are used to either define, drive or resolve the story is inaccurate enough that, as a description, it would include such works as Bones, CSI, etc; which are notably not Science Ficiton works. 

It is often contrasted with Fantasy, in which the story takes place in an unadvanced era, similar to that of the Middle Ages, and may involve magic.

 

Science Fiction is now considered to be a seperate genre to Fantasy, although this has not always been the case, with the genre being known as 'Science Fiction and Fantasy' comparitively recently, and in the past the two genres being conflated into the single genre of 'Science Fiction'.