Zombies

Zombies are any creature that somehow has rised from the grave to do any task that a demon, necromancer (practitioner of the magic of the dead) and lilith (which actually she was or used to be in this case the 1 spouse of Adan and then turned psycho and left and after that sold her sould to Lucifer for youth, power and inmortality) and she can also make spells to make the dead guys alive AGAIN.

In most cases the zombie(s) will have an inmidieate hunger for human flesh but in some exceptions the zombies are "good" and after some few days they turn into the zombie(s) we all love the stupid slow (not necesarily) always hungry zombies that eat humans (that is so nice isnt it NOT)

Some zombies arent actually living corpses in the search of humans to feast on some are actually ghosts, demons or anything that dosent need a "host" to be "alive" and will attack not anyone they encounter BUT the ones that are targets for them (like the winchesters in a episode) and they can only be defeated by using salt (actually not but it helps since they are very bad and want to kill you) iron (like any badass in the whole series, well almost all of them) and the only REAL way to deal and "kill" (well you cant because they arent actually alive dontcha think?) is to do a spell that will force their souls to RIP (rest in peace, for those who dont know what it means)