The first approach of a zombie taxonomy that aims to classify zombie types is by studying the possible origins of zombies.
Two kinds of zombies exists in modern popular culture: one created by voodoo resulting in a spell-bound near dead state, and cannibal creatures created by scientific experimentation of strange chemicals on living humans (as popularized by a series of films on the "living dead" theme).
Zombies can also be classified according to their physical and mental characteristics. There are the slow zombies and the new breed of fast zombies found in movies like 28 days later or Zombieland. Purists will argue that the latter are not technically zombies but infected living humans.