Zombies, as popularly depicted in movies, television shows, and video games, are not real. They are fictional monsters often portrayed as reanimated corpses that crave human flesh. This concept originated in folklore and has been popularized in modern culture, particularly through horror films like "Night of the Living Dead."
However, the idea of zombies has roots in various cultural beliefs and myths, particularly in Haitian Vodou, where it's said that a person can be revived by a sorcerer after death, although this is more about spiritual belief than the flesh-eating creatures commonly seen in entertainment.
In the realm of science, certain parasites and diseases can manipulate the behavior of their hosts in ways that might resemble "zombie" behavior, but these are far removed from the supernatural zombies of fiction.