OCI versus PIO cards: what actually changed
Launch library · evergreen read

For many years, people of Indian origin living abroad could apply for a PIO card, a document that granted certain travel and residency related benefits without full citizenship. The Overseas Citizen of India scheme, generally known by the acronym OCI, was later introduced as a more comprehensive alternative, and the two schemes were eventually merged so that OCI became the single ongoing option.
The two documents were never identical in scope. A PIO card typically required periodic renewal and carried a defined validity period, while OCI registration is generally treated as a lifelong status tied to the holder's passport, requiring the OCI document itself to be updated mainly when a new passport is issued or significant personal details change.
Because the PIO card scheme was discontinued in favour of OCI, anyone who still holds an old PIO card is generally expected to have converted it to OCI status by now, since PIO cards are no longer treated as valid on their own. Anyone still holding paperwork from that earlier scheme is best placed checking current requirements directly rather than assuming old rules still apply.