By IndiaHub 
An OCI (Overseas Citizen of India) card allows an Indian citizen who holds a foreign passport, i.e., is currently a national of a foreign country, a multi-purpose, multi-entry lifelong visa to India. OCI cardholders can stay in India as long as they want, and do not have to apply for a visa if they wish to visit India. They can also get employed in India and buy properties, except for agricultural land in the country.