Iwi refers to the largest social units in Māori society, representing tribes or groups of people who share a common ancestry. Each iwi has its own unique history, traditions, and governance structures, playing a crucial role in the cultural identity of the Māori people in New Zealand. Iwi are often composed of several hapū (sub-tribes) and are responsible for the well-being of their members. They engage in various activities, including land management, cultural preservation, and political representation, ensuring the continuation of their heritage and rights within New Zealand's society.