Moksha (ˈməʊkʃə; मोक्ष, ), also called vimoksha, vimukti, and mukti, is a term in Hinduism, Buddhism, Jainism and Sikhism for various forms of emancipation, enlightenment, liberation, and release. In its soteriological and eschatological senses, it refers to freedom from saṃsāra, the cycle of death and rebirth. In its epistemological and psychological senses, moksha is freedom from ignorance: self-realization, self-actualization and self-knowledge. In Hindu traditions, moksha is a central concept and the utmost aim of human life; the other three aims being dharma (virtuous, proper, moral life), artha (material prosperity, income security, means of life), and kama (pleasure, sensuality, emotional fulfillment). Together, these four concepts are called Puruṣārtha in Hinduism. In some schools of Indian religions, moksha is considered equivalent to and used interchangeably with other terms such as vimoksha, vimukti, kaivalya, apavarga, mukti, nihsreyasa and nirvana. However, terms such as moksha and nirvana differ and mean different states between various schools of Hinduism, Buddhism and Jainism. The term nirvana is more common in Buddhism, while moksha is more prevalent in Hinduism. Moksha is derived from the root, , which means to free, let go, release, liberate. The definition and meaning of moksha varies between various schools of Indian religions. Moksha means freedom, liberation; from what and how is where the schools differ. Moksha is also a concept that means liberation from rebirth or saṃsāra. This liberation can be attained while one is on earth (jivanmukti), or eschatologically (karmamukti, videhamukti). Some Indian traditions have emphasized liberation on concrete, ethical action within the world. This liberation is an epistemological transformation that permits one to see the truth and reality behind the fog of ignorance. Moksha has been defined not merely as absence of suffering and release from bondage to saṃsāra.