Overseas citizens of India (as per Overseas Citizenship of India Schem

Overseas citizens of India (as per Overseas Citizenship of India Scheme as operational from December 2005) shall not be entitled to

multiple entry, multipurpose lifelong visa to India
exemption from reporting to police authorities for any length of stay in India
parity with NRI's in financial, economic and educational fields except in the question of agricultural or plantation properties
voting rights in India
This question was previously asked in
UPSC CAPF – 2012
Overseas Citizens of India (OCI) are granted several benefits by the Government of India, but they are not citizens of India and therefore do not possess political rights, including voting rights in India.
The OCI scheme allows persons of Indian origin (excluding those from Pakistan and Bangladesh) to live and work in India indefinitely with specific rights, while retaining their foreign citizenship.
OCI cardholders are entitled to a multiple entry, multipurpose lifelong visa for visiting India and are exempted from registration with the Foreigners Regional Registration Officer (FRRO) for any length of stay. They have parity with NRIs in financial, economic, and educational fields, except in matters relating to the acquisition of agricultural or plantation properties. However, they do not have the right to vote, be a member of a Legislative Assembly or Legislative Council, or hold constitutional posts like President, Vice-President, Judge of Supreme Court or High Court, etc.