Siddha literary tradition is understood as the written in the local language literature to propagate the principles of Vajrayana Buddhism.
The Vajrayana Siddhas who wrote the Siddha literature were mostly engaged in the eastern region of India. It is still as a matter of history that Siddha literature developed between Eighth and Thirteenth Centuries only. It used criticism of caste system and external forms of worship. Thai and Siddha literature was mainly focused on the exaltation of the human body and the natural method of spiritual practice known as Sahaja sadhana. It composed different poetic types and kinds of using doha, chaupai, soratha, arilla, rola , and some others.