Baradari or Birâdrî (Persian: برادری) means Brotherhood originating from the Persian word برادر Baradar meaning "Brother". In Pakistan and India it is used to denote a number of social strata among South Asian Muslims. According to author Anatol Lieven, "the most important force in [Pakistani] society" are Baradari, usually far stronger than any competing religious, ethnic, or ideological cause. Parties and political alliances in Pakistan are based on Baradari, not ideology.
The Hindu caste system influenced the in South Asian Muslims and resulted into formation of Brotherhood or communities that practiced social stratification. The Hindus of different castes converted to Islam due to Sufi missionaries formed their own baradaris. The tribal and clan affiliation are also considered as biradaris in Pakistan.