Kung hunter-gatherers of Botswana and Namibia, who number in the hundreds. The term is applied to Kenya's Maasai herders and Kikuyu farmers, and to members of these groups in cities and towns when they go there to live and work. Tribe is used for Hutu and Tutsi in the central African countries of Rwanda and Burundi. And in each one, Hutu and Tutsi lived interspersed in the same territory. They spoke the same language, married each other, and shared virtually all aspects of culture.
Tribe is used for groups who trace their heritage to great kingdoms.
It is applied to Nigeria's Igbo and other peoples who organized orderly societies composed of hundreds of local communities and highly developed trade networks without recourse to elaborate states. Tribe is also used for all sorts of smaller units of such larger nations, peoples or ethnic groups. The followers of a particular local leader may be called a tribe. Members of an extended kin-group may be called a tribe. People who live in a particular area may be called a tribe.