Soft science fiction, often abbreviated as "soft sci-fi," is a subgenre of science fiction that emphasizes the social sciences, such as psychology, sociology, and anthropology, over the hard sciences like physics and chemistry. Unlike its counterpart, hard science fiction, which focuses on scientific accuracy and technical detail, soft science fiction explores the human condition, societal changes, and speculative futures through the lens of technology and its impact on society. This genre often delves into themes of ethics, culture, and human relationships, using futuristic settings and speculative technology as a backdrop to examine how these elements interact and affect individuals and societies. Soft science fiction is less concerned with the how and why of technology itself, and more interested in the implications and consequences of technological and societal evolution, making it a rich field for exploring complex characters, speculative societies, and philosophical questions.

The category of "Time travel" books typically involves stories where characters travel through time, either intentionally or accidentally, to different eras or periods in history. These books often explore the consequences of altering the past or future, and the challenges and dangers that come with navigating different time periods. Time travel books can span a variety of genres, including science fiction, historical fiction, romance, and adventure, and offer readers a unique perspective on the possibilities and complexities of time travel.

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