Post-apocalyptic fiction is a subgenre of speculative fiction that explores the aftermath of a catastrophic event that leads to the collapse of civilization. This genre often focuses on themes such as survival, the resilience of humanity, and the moral dilemmas faced by characters in a world where societal norms and structures have been dismantled. It typically presents a bleak view of the future, contrasting the remnants of the past with the harsh realities of a transformed world.