Answer:
Iwi Maori means the Maori Tribes. There are many 'tribes' of people in NZ who descend from a common ancestor and/or come from a common waka (one of the canoes which brought the original maori to NZ from their homeland - Hawaiiki). Some of the most well-known Iwi (tribes) are: Nga Puhi, Ngati Whatua, Tainui, Te Arawa, Tuhoe, Ngati Porou, Te Ati Awa, Kai Tahu...