A haunted house is defined as a house that is believed to be a center for supernatural occurrences or paranormal phenomena. A haunted house may allegedly contain ghosts, poltergeists, or even malevolent entities such as demons.
Haunted houses are often seen as being inhabited by spirits of deceased who may have been former residents or were familiar with the property. Supernatural activity inside homes is said to be mainly associated with violent or tragic events in the building's past such as murder, accidental death, or suicide—sometimes in the recent or ancient past. Among many cultures and religions it is believed that the essence of a being such as the 'soul' continues to exist. Some philosophical and religious views argue that the 'spirits' of those who have died have not 'passed over' and are trapped inside the property where their memories and energy are strong. Entities which are said to 'haunt' homes are often believed to make noises, appear as apparitions, and shift or launch physical objects. This is sometimes manifested into 'poltergeist activity', poltergeist meaning 'noisy spirit'. Traditionally an exorcism is the method used to remove unwelcome spirits from the property.