We use the word ghost and spirit interchangeably but there really is a strong difference between them. According to the late Hans Holzer, professor of Parapsychology and writer of 119 books on the subject, "Ghosts are similar to psychotic human beings, incapable of reasoning for themselves. ... Spirits on the other hand are the surviving personalities of all of us who pass through the door of death in a relatively normal fashion."
We learn from him that ghosts are tied to the location of their death, usually a sudden or tragic one, and they often don't realize that they are dead. In most cases, they have "unfinished business" as the deceased person does not accept the way in which they died. The simplest form of unfinished business can be as innocent as a person being attached so strongly to their home that they cannot leave it behind and pass over. They are known as "caretakers" and want to stay to make sure the building is being taken care of properly by future owners and also to their approval. At the end of the scale, unfinished business can take the form of dark energy when a person's death is extremely violent and unexpected.
Surprisingly, only a small percentage of paranormal sightings are true ghosts. The majority of them are really sightings of what we call "residual energy" - when an emotional event is replayed over and over again, at the same spot, and at the same time. With the study of ROSS we learn you every detail and skills how to work with energies.