Psychics are humans that posses telepathic abilities. These abilities generally run in families, though may skip a generation or two and are extremely rare. Psychics are not known to the general populace and they keep themselves hidden from other supernaturals as well. As such someone may know a psychic without actually knowing about the abilities they posses.
What is publicly known about them is that there have always been rumors of those that can see the future, those that can read minds, or those that can move objects across a room. These are widely accepted as mere stories, as there is no proof one way or another. Even other supernaturals are uncertain that true psychics exist, and rarely do they believe it when they hear of one.
Those psychics that announce themselves publicly are generally assumed to be con-artists or fakes.