There is a vast and sometimes bewildering storehouse of Hindu scriptures available that can be classified into several categories. The 4 main ones are shruti (that which is heard), smṛti (that which is remembered), itihāsa (history), and purāṇa (the most ancient, yet evernew). Shruti and the smṛti are the two authoritative sources of Sanātana Dharma. It is important to note that the historical accounts given in Hindu scriptures are sometimes referred to as mythology. They are historical accounts of events that happened, not be classified or dismissed as mythology.