Science Fiction   Science fiction, often called “sci -fi,” is a genre of  fiction  literature whose content is imaginative, but based in  science . It relies heavily on  scientific  facts, theories, and principles as support for its settings, characters, themes, and plot-lines, which is what makes it different from fantasy. Some examples of sci-fi movies are Bladerunner , The Martian and Avatar.    Some sub genres of science fiction are:   *Alien Invasion - Independence Day   *Cyberpunk - Bladerunner   *Dying Earth - Take Shelter   *First Contact - Star Trek   *Galactic Empire - Star Wars   *Human Development - Shutter Island   There are many other sub genres that make up science fiction.