There are many different kinds of zombie, but i will just go over the two most common. The voodoo zombie and the common zombie.
A voodoo zombie is not actually a zombie, it is a person with brain damage thought to be dead, and then rising from their graves with no real objective other than surviving. Voodoo zombies are created when a shaman paralyzes them with a strange powder made from jellyfish venom. The victim's heart rate and other life supporting functions are operating at a bare minimum, so they are commonly mistaken for dead. Once they are buried, voodoo zombies sometimes wake up from their little nap time to find themselves in a shallow grave and little to no oxygen. From the lack of oxygen, they lose brain cells and are more mentally disabled than living dead.
The common zombie is created only when infected with a virus called "solanum", which is a 100% lethal virus that operates the brain of human vivtims, but nothing else. Common zombies can transfer their virus to animals, but animals DO NOT reanimate. Ingestion of infected flesh will not infect the one who ate it, it will just kill you. Common zombies operate on only the most basic instinct, to eat. They are completely self-sufficient, and do not require any of the functions humans need to survive. There is no way to deter or distract a zombie, and the only way to kill the persistant bastards is to destroy the brain via headshot or blunt force.
#1: Damn bro, you see that zombie get up outta the grave? I think it wants to eat me!
#2: Naw man, thats just some voodoo zombie, its pretty much just a retard. See that rotting walking corpse that doesnt bleed? That nigga wants to eat you.