Kalpasutras 

The Kalpasutras are classified into the following three types depending upon their mutual dependence and complimentary potential – Shrautrasutra, Dharmasutra and Gruhyasutra. The Shrautrasutra gives information on fire sacrifices from the Vedas.

The Dharmasutra gives an account of the dictums of Righteousness (Dharma) or religious duties to be performed as well as traditional, social, familial and religious customs. Generally the Dharmasutras are in prose form in the Arsha language (language of the evolved).

The Gruhyasutra describes religious rites like the sixteen spiritual rites to be performed by a householder along with his wife for the welfare of his family,