The evolution of zombie folklore itself is even interesting. Zombie, or zombi, as it were, is thought to have originated from Haitian vodou (learned about in the early 19th century, but existing long before in previous religions leading up to Haitian voodoo). It was first thought that a zombi was a servant of a bokor (magical practitioner) who could revive the dead for their servitude.
Modern zombies are typically always ‘biological’ zombies (zombism spread via pathogens), example of this are numerable: Resident Evil, Dead Rising, Left4Dead, Dead Island, Walking Dead, etc. Thus, the term was extended from being a revived dead for servitude [via supernatural forces], to any phenomenon of something dead returning from the dead.
One interesting thing to note is Hatian zombis were never described as cannibalistic (though, actual zombis which were procured by a process of poisoning a person into a catatonic state then revived were described as delusional, irrational and psychotic.) Dawn of the Dead and Night of the Living Dead are early examples of zombies desiring flesh (movies in the late 60s, early 70s), thought the first example of zombies specifically craving brains was introduced in Return of the Living Dead. Since then, it has been a consistent theme for zombies to crave human/living flesh (usually ascribed as being their primal urge to sustain themselves, though some zombies apparently do not explicitly require sustenance by either food or water). But I really do wonder why/where the idea came from (especially the brains part, why brains?).
On a personal note, I prefer modern biological zombies, as it adds to the realism that it could happen (vs.magic mumbo jumbo) as forms of “zombism” do exist in the animal kingdom (like some people have provided previously, as well as examples of hives being controlled by pheromone using monarchs), though, none of these actually resurrect dead tissue, but still, you get what I mean.