sanatana dharma, in Hinduism, term used to denote the “eternal” or absolute set of duties or religiously ordained practices incumbent upon all Hindus, regardless of class, caste, or sect. Different texts give different lists of the duties, but in general sanatana dharma consists of virtues such as honesty, refraining from injuring living beings, purity, goodwill, mercy, patience, forbearance, self-restraint, generosity, and asceticism. Sanatana dharma is contrasted with svadharma, one’s “own duty” or the particular duties enjoined upon an individual according to his or her class or caste and stage of life. The potential for conflict between the two types of dharma (e.g., between the particular duties of a warrior and the general injunction to practice non-injury) is addressed in Hindu texts such as the Bhagavad Gītā, where it is said that in such cases svadharma must prevail.
The term has also more recently been used by Hindu leaders, reformers, and nationalists to refer to Hinduism as a unified world religion. Sanatana dharma has thus become a synonym for the “eternal” truth and teachings of Hinduism, the latter conceived of as not only transcendent of history and unchanging but also as indivisible and ultimately nonsectarian.
Excerpt from Encyclopaedia Britannica Article Sanatana Dharma