"The Puranas are post-Vedic texts which typically contain a complete narrative of the history of the Universe from creation to destruction, genealogies of the kings, heroes and demigods, and descriptions of Hindu cosmology and geography. There are 18 canonical Puranas, divided into three categories, each named after a deity: Brahma, Vishnu and Shiva. There are also many other works termed Purana, known as 'Upapuranas."