There are 3 kind of vampire servants in VtM at least,familiars(who drink vampire blood with frequency,but never been Embraced de facto,comparable as pets),Ghouls(the ones bound into serving by having a taste of blood but never fed in a regular basis),and zombies(people who failed surviving the Embrance completely and as result,cant die normally and are bound in a eternal hunger)...passing to the more traditional lore,familiars are most of the servants bound by drinking vampire blood(MC was in that condition till the master death),a ghoul is a stronger kind of zombie(normally born by unnatural means like giving vampire blood to a zombie),and finally there are zombies(which you guys must have noticed,the vampires seem to produce them effortlessly by simply not putting their victims on a grave)