You have built a group of mortals from whom you can feed without fear. A herd may take many forms, from circles of kinky clubgoers to actual cults built around you as a god-figure. In addition to providing nourishment, your herd might come in handy for minor tasks, although they are typically not very controllable, closely connected to you or even highly skilled (for more effective pawns, purchase Allies or Retainers). Your Herd rating adds dice to your rolls for hunting.
Taken from Vampire: The Masquerade (Revised) P131.