How do you know if you're watching one? It's not as simple a question as it might at first seem, because
what constitutes a zombie has changed over the years and continues to evolve. Recent films such as
28 Days Later and
Dawn of the Dead have broadened the definition beyond the
walking dead to include still-living characters infected with an incurable disease that extinguishes their personalities and turns them into bloodthirsty killers. Even the classic conception of the zombie, as a corpse that rises from the grave to feed on the glash of the living - of at the very least slaughter them - became the standard only after the release of the classic 1968 horror film
Night of the Living Dead.