Zombies are humans that have been infected by a virus. The virus possesses the motion part of the brain after death and causes them to move sluggishly, they crave living human brains as nutrition. Zombies are not real.
Zombies are believed to be people who resurrect and come back to life through mysterious ways like witchcraft. When one turns to a full-fledged zombie, the only thing that runs in his/her mind is to bite other people.