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Shruti means "that which is heard" and refers to sacred literature considered unwritten (Apaurusheya) and orally transmitted. It comprises:
Smriti means "that which is remembered"; it refers to literature that is written down and interpreted or commented upon by learned experts. Smriti literature is more structured and includes commentaries, codifications, and systematizations of prior knowledge. It is divided into several categories including:
Kalpa Vedanga is especially significant as it defines the actual performance of rituals. It is presented in formulas known as Sutras and is split into:
Kalpa's codification of rituals laid the foundation for the development of Dharma Shastras (codes governing Hindu social law, property, and ritual).
The Upavedas aim to ensure that human life is happy, safe, and secure by promoting well-being and holistic development. They demonstrate the secular and practical aspects of Vedic literature by engaging with life sciences, arts, and skills.
These systems focus on the evolution of philosophical thought from logic and ritual (Mimamsas) to metaphysics (Vedanta). Notably, Materialism (Bhoutikavada) is first developed in the Vaisheshika philosophy which posits that "Man comes from dust and returns to dust."
This tradition evolved from a rich oral heritage rooted in Vedic times, merging mythology, history, legends, and folk tales. The Indian tradition integrates mythology and history so closely that making a clear distinction is often difficult. Local legends, themes, and the need for moral instruction all contributed to the development of these genres.