A poltergeist is a type of ghost or supernatural entity known for causing physical disturbances, such as loud noises, moving objects, and even physical harm. The term originates from the German words 'poltern' (to make noise) and 'geist' (ghost), reflecting the chaotic nature of these entities. Poltergeist activity is often associated with a particular person, usually a young individual, who may unknowingly be the source of the disturbances. Unlike traditional ghost stories that involve spirits of the deceased, poltergeists are often considered to be manifestations of psychic energy. This phenomenon has been the subject of various studies and has inspired numerous films and books, including the famous movie Poltergeist released in 1982.