Indigenous people are the original inhabitants of the land while an ethnic group is a social group set apart by common ties like race, language or culture. Some key differences are that indigenous people predate the formation of the modern nation state while ethnic groups exist within a larger society. The document then provides examples of major indigenous groups in the Philippines like the Igorots, Lumads, Mangyans and Negritos and describes some of their traditional clothing, beliefs and practices. It also lists examples of ethnic groups found in different parts of the Philippines such as Tagalog, Ilocano and Bicolano. Studying indigenous and ethnic groups is important to understand the cultural diversity and heritage of the people in the Philippines.