How were the puranas different from …

The oldest literature of Indian thought is the Veda, a collection of religious and philisophical poems and hymns composed over several generations beginning as early as 3000 BC. The Veda was composed in Sanskrit, the intellectual language of both ancient and classical Indian civilizations. Four collections were made, so it is said that there are four Vedas. The four as a group came to be viewed as sacred in Hinduism.
The Puranas contain the essence of the Vedas. They were written to impress the teachings of the Vedas onto the masses and to generate devotion to God in them. They have five characteristics: history, cosmology (with symbolical illustrations of philosophical principles), secondary creation, genealogy of kings, and Manvantaras (the period of Manu's rule consisting of 71 celestial yugas).