There are several types of ghosts that can manifest or be sensed by the living. The document outlines interactive ghosts, which may be friendly deceased family members that can touch or make noises to communicate. Ectomists appear as ghostly mists or vapors that sometimes take the form of bodies. Orbs are described as the most commonly photographed anomaly, appearing as transparent balls of light that move fast. Residual ghosts endlessly replay a particular past event from when they were alive. Demons are considered a different entity entirely and described as very negative and inhumane.