From the United Nation site:
There are an estimated 370 million indigenous people in the world, living across 90 countries. They make up less than 5 per cent of the world’s population, but account for 15 per cent of the poorest. They speak an overwhelming majority of the world’s estimated 7,000 languages and represent 5,000 different cultures.
Indigenous peoples are inheritors and practitioners of unique cultures and ways of relating to people and the environment. They have retained social, cultural, economic and political characteristics that are distinct from those of the dominant societies in which they live. Despite their cultural differences, indigenous peoples from around the world share common problems related to the protection of their rights as distinct peoples.
Indigenous peoples have sought recognition of their identities, way of life and their right to traditional lands, territories and natural resources for years, yet throughout history; their rights have always been violated. Indigenous peoples today, are arguably among the most disadvantaged and vulnerable groups of people in the world. The international community now recognizes that special measures are required to protect their rights and maintain their distinct cultures and way of life.