What are ghosts? No one knows for certain.
Ghosts and hauntings seem to be a relatively common part of the human experience.
The traditional view of ghosts is that they are the spirits of dead people that for some reason are “stuck” between this plane of existence and the next, often as a result of some tragedy or trauma. Many ghost hunters and psychics believe that such earth-bound spirits don’t know they are dead. Veteran ghost hunter Hans Holzer says, “A ghost is a human being who has passed out of the physical body, usually in a traumatic state and is not aware usually of his true condition. We are all spirits encased in a physical body. At the time of passing, our spirit body continues into the next dimension. A ghost, on the other hand, due to trauma, is stuck in our physical world and needs to be released to go on.”
Ghosts exist in a kind of limbo in which they haunt the scenes of their deaths or locations that were pleasant to them in life. Very often, these types of ghosts are able to interact with the living. They are, on some level, aware of the living and react to being seen on the occasions that they materialize. Some psychics claim to be able to communicate with them. And when they do, they often try to help these spirits to understand that they are dead and to move on to the next stage of their existence.
Information from About.com
Original photo digitally altered and enhanced