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Alternate timelines is a speculative fiction category that explores "what if" variations on history, personal choices, or cosmic events by presenting worlds where key moments diverged and led to different outcomes. Books in this category may reimagine real historical events (e.g., a different winner of a war), follow characters who travel between or alter timelines, or depict parallel universes that reflect the consequences of altered decisions or technologies. Central themes include causality, identity, political and social change, and the moral or practical consequences of altering the past or imagining alternative futures. The tone can range from intimate character studies to sweeping political epics or hard science-fiction thought experiments, but all works hinge on the tension between what was and what might have been.

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