Traditional midwives provide basic health care, support and advice during and after pregnancy and childbirth, based primarily on experience and knowledge acquired informally through the traditions and practices of the communities where they originated. They usually work in rural, remote and other medically underserved areas. TBAs may not receive formal education and training in health care provision, and there are no specific professional requisites such as certification or licensure. A traditional birth attendant may have been formally educated and has chosen not to register. They often learn their trade through apprenticeship or are self-taught; in many communities one of the criteria for being accepted as a TBA by clients is experience as a mother. Many traditional midwives are also herbalists, or other traditional healers. They may or may not be integrated in the formal health care system. They sometimes serve as a bridge between the community and the formal health system, and may accompany women to health facilities for delivery.