Exorcism is a special kind of religious practice in which a person who is believed to be controlled by an evil spirit is said to be “exorcised” or freed. It usually involves a religious person, like a priest, reciting prayers and using special rituals to drive away the evil spirit. The rituals often involve objects, like holy water, crosses, or special prayers that are said to help ward off the evil spirit. The person whose spirit is believed to be controlled may experience physical symptoms, like vomiting, shaking, or speaking in a strange language, and these usually stop once the exorcism ceremony is complete.