Science fiction (often abbreviated Sci-Fi or SF) is a genre of speculative fiction that has been called the "literature of ideas". It typically deals with imaginative and futuristic concepts such as advanced science and technology, time parallel universe, fictional space extraterrestrial life. Science fiction often explores the potential consequences of scientific fiction
Science fiction, whose roots go back to anciemt times, is related to fantasy, horror, and superhero fiction, and includes many subgenres However its exact definition has long been disputed among authors, critics, and scholars.
Science fiction literature, film, television, and other media have become popular and influential over much of the world. Besides providing entertainment, science fiction can also criticize present-day society, and is often said to generate a "sense of wonder".