‘Person of Indian Origin (PIO)’ means a citizen of any country other than Bangladesh or Pakistan, if
They at any time held Indian Passport, or,
They or either of their parents or grandparents was a citizen of India by the Constitution of India or the Citizenship Act, or,
The person is a spouse of an Indian citizen or a person referred to in sub-clauses (1) or (2).
For more information, click here.