The Abhidharma literature is a collection of commentaries on the sutras. It contains literature that we generally classify as philosophy, along with other works of a more religious or historical nature.
The earliest version of the Abhidharma was produced in the Pali language. Various schools of Buddhism quickly developed their own versions of the Abhidharma and argued strongly for the superiority of their own interpretations.
However, only three Abhidharma literatures still exist today: the Pali Abhidhamma (using the Pali spelling for this term), the Sarvastivadin Abhidharma, and the Sariputra Abhidharma of the Dharmaguptaka school