Demonology is the study of demons, their characteristics, and their influence on human affairs. It often involves understanding the nature of evil spirits, their hierarchy, and how they interact with the physical world. This field is found in various religious and cultural traditions, including Christianity, Islam, and Hinduism. In many belief systems, demons are seen as malevolent beings that can possess individuals or cause harm. Demonology also explores methods of protection and exorcism, which are practices aimed at removing or defending against these entities. The subject has been a part of folklore, literature, and religious texts throughout history.