Demonic possession is a belief that a person's body and mind can be controlled by a malevolent spirit or demon. This phenomenon is often characterized by unusual behavior, changes in personality, and sometimes physical manifestations. Many cultures and religions, including Christianity and Islam, have accounts of possession, often linking it to moral or spiritual failings. Exorcism is a practice used to expel the possessing entity, commonly performed by a religious leader. Symptoms of possession may include speaking in unknown languages, exhibiting superhuman strength, or aversion to sacred objects. While some view possession as a spiritual issue, others attribute these experiences to psychological conditions.