The epic Mahabharata is one of the largest poems in the world and is divided into 18 Parvas (Sections). It is looked upon as Pancama-Veda (The Fifth Veda) as it contains all that is said in the Veda. The Mahabharata unfolds both Dharma-Sastra and Moksa-Sastra, as it contains Bhagavad Gita.
An Audio Course on Ithihasa & Purana : Mahabharata by Swami Dayananda Saraswati.
