"Poltergeist" is a German word meaning "noisy spirit". Current research indicates, however, that poltergeist activity may have nothing to do with ghosts or spirits. Since the activity seems to center around an individual, it is believed that it is caused by the subconscious mind of that individual. It is, in effect, psychokinetic activity. The individual is often under emotional, psychological or physical stress (even going through puberty). Effects can include rapping on walls and floors, the physical movement of objects, effects on lights and other electric appliances - even the manifestation of physical phenomena.
Also called will o' the wisps or spooklights. What they are is most likely many spirits traveling together and with enough energy light is given off. Although scientist have theorized that its possible that these are marsh gas rising up, UFOs, or sub-atomic particles burning up, many who have followed these lights have gotten lost, disappeared or even faced death. They are a big mystery. Sometimes they look like 100's of glowing balls traveling. Perhaps they are gateways to the spiritual world and the dead travel together through them. A lot of areas that have ghost lights have had tragedies happen in them areas such as train wrecks or massacres.
These are very elusive ghosts. Many theories come about them saying they are entities from other worlds, live underground, are ghost, demons etc. But they fit all the categories as a ghost. They are usually solid or transparent black. Most are seen near walls, as if the shadow has become alive. Often the shadow ghost has red eyes. They are very quick.
These are rare, but an apparition basically is a ghost in its full form. They usually have the same clothes and appearance as they had before they died. They will not hurt you. They may scare you since they appear transparent. The only time they appear is when they want to tell you something and at times they become desperate to gain attention. They will move things around, make noise, talk, cause disruptions with appliances such as lights, televisions, stereos, etc. Most of the time talking to them generates a response. You may see apparitions of your family members. They may come to visit you, perhaps relate a message by making things happen, causing familiar smells, opening a book, calling on the phone, etc. They do seem to show emotions such as happiness, anger and sadness, so they must be treated like us.
This generally is a thick mist, fog or plasma type of material that shows up on cameras. This ectoplasm is a sign that an apparition is either manifesting or has just got done manifesting. It can appear in many colors.
Orbs are energy. They are also referred to as globes of light, globules, energy balls, etc. Some of them appear in different colors, some are white and transparent. Some have faces on them and some give off brilliant light. They are harmless. When orbs are in motion and they have tails on them or motion trails. These are called plasma or plasmoid trails or streamers. Only a camera can catch this. HOWEVER, orbs can be bugs, dust or errors in digital cameras. We do NOT consider them evidence of a haunting.