A zombie apocalypse is a fictional scenario where society collapses due to the outbreak of a virus or infection that turns people into zombies. These zombies are typically depicted as mindless, flesh-eating creatures that pose a threat to the living. The concept often explores themes of survival, fear, and the breakdown of social order. In popular culture, zombie apocalypses are commonly portrayed in movies, video games, and books, such as The Walking Dead and World War Z. These stories often focus on the struggles of small groups of survivors as they navigate a dangerous world filled with zombies and other threats, highlighting human resilience and morality in extreme situations.