what do the zombie tokens mean in magic cards?

[Kerdo]

when a card says "zombie token" what does it mean exacly

[DatAsh]

A creature token is a creature that is not a card.

[Kenji]

To elaborate, certain cards will create creature tokens - Grave Titan is an example. Creature token cards are an optional way to physically represent creature tokens that go on the battlefield. You can also use anything else you have handy: coins, bits of paper, etc. The only stipulation is that whatever you use has a way to show the tokens' tapped or untapped status.