Sci-fi novels, short for science fiction novels, explore imaginative concepts often based on advanced science and technology. They can include themes like space exploration, time travel, and extraterrestrial life. These stories often take place in futuristic settings or alternate realities, allowing readers to envision possibilities beyond our current understanding. Many sci-fi novels also address social and ethical issues, prompting readers to think critically about the implications of scientific advancements. Notable authors in this genre include Isaac Asimov, Arthur C. Clarke, and Philip K. Dick, whose works have influenced both literature and popular culture.