This document provides an overview of science fiction including definitions, key elements, themes, and related genres. It defines science fiction as a form of fiction that deals with the impact of actual or imagined science on society or individuals. Key elements include stories set in the future that present theoretically plausible plots involving technology, space exploration, aliens, or futuristic inventions. Two common themes are the relationship between individuals and society, and the development of computer technology and artificial intelligence. Related genres discussed include utopian, dystopian, and ecotopian literature.