This document provides an overview and comparison of fantasy and science fiction genres. It defines fantasy as imaginative fiction dealing with alternate realities that suspend scientific explanations, exploring deeper realities and eternal truths. Science fiction is defined as literature exploring possible futures through speculation about life in other worlds and times, often focusing on technology. The document outlines common elements of each genre such as elves and magic in fantasy, and robots and space travel in science fiction. It concludes with a brief comparison of the origins and purposes of fantasy and science fiction.