The state of Bihar has a population of about 12.85 Crore (as of 2020). The religious people here mostly follow either Hinduism and Islam, which are major religions in the state. Bihar has more than 82% of Hindus and around 17% of the population are Muslims.

Apart from these, a small portion of people follow Christianity, Sikhism or Jainism. People of Bihar are known as “Biharis”, and these people group themselves into three main Indo-Aryan ethnolinguistic groups - Bhojpuris, Maithils and Magadhis. These are further divided into other ethnic groups and castes.