Alternate history is a genre that explores historical scenarios with different outcomes, asking "what if" questions about pivotal moments in history. These stories imagine how the world might be different if key historical events had unfolded differently - from different outcomes in wars to different scientific discoveries or political decisions. Alternate history allows authors to examine the forces that shape history while entertaining readers with fascinating speculation about alternative timelines. What makes alternate history unique is its combination of historical research and creative speculation, offering both entertainment and insight into the contingent nature of historical development.

Alternate history has evolved from early speculative works to a sophisticated genre that combines historical research with creative speculation. The genre gained prominence in the 20th century with works like Philip K. Dick's "The Man in the High Castle" and has continued to grow, exploring an ever-wider range of historical periods and scenarios. Modern alternate history often incorporates diverse perspectives and examines how different outcomes might have affected marginalized communities.