Indian people or Indians are citizens of India, the second most populous nation containing 17.50% of the world’s population, and people of Indian heritage. The Indian nationality consists of many regional ethno-linguistic groups, reflecting the rich and complex history of India. The diaspora populations with Indian ancestry, as a result of emigration, are somewhat widespread most notably in Southeast Asia, South Africa, Australia, United Kingdom, Middle East, Trinidad and North America. Population estimates vary from a conservative 12 million to 20 million diaspora.