A deity, also known as a god or goddess, is a supernatural being that is considered divine or sacred. Deities are often worshiped by people who believe that they control or exert force over some aspect of the world. While not all religions involve deities, they are central to most of the worlds religions. Deities can be divided into categories based on their views on the nature of deities, such as whether there is a single supreme god or goddess or whether there are multiple gods and goddesses. Monotheistic religions are those in which there is only one god or goddess, while polytheistic religions are those in which there are multiple gods or goddesses. The divine nature of deities is believed to be immortal goodness and powerfulness.