|Structure of the Tipitaka|
The second category, the Sutta Pitaka, consists primarily of accounts of the Buddha's life and teachings. The Sutta Pitaka has numerous subdivisions: it contains more than 10,000 suttas.
The third category is known to the Theravada school as the Abhidhamma Pitaka. It is a collection of texts in which the underlying doctrinal principles presented in the Sutta Pitaka are restated and explained in more a systematic framework. In Mahayana and Vajrayana tripitakas, this pitaka often contains treatises that are referred to as shastras.