Monasticism (from Greek μοναχός, monachos, derived from μόνος, monos, "alone") or is a religious way of life in which one renounces worldly pursuits to devote oneself fully to spiritual work. Monastic life plays an important role in many Christian churches, especially in the Catholic and Orthodox traditions. Similar forms of religious life also exist in other faiths, most notably in Buddhism, but also in Hinduism and Jainism, although the expressions differ considerably. By contrast, in other religions monasticism is criticized and not practiced, as in Islam and Zoroastrianism, or plays a marginal role, as in Judaism.