Once you invest in NPS, you will be periodically contributing savings into your Permanent Retirement Account (PRA) and shall use the accumulations at retirement to procure a pension for the rest of your life. The NPS is based on a unique individual Permanent Retirement Account Number (PRAN) created for individual subscribers, with their details. Hence PRAN is like a unique and portable PAN Card which will stay with the investor lifelong. Registration for PRAN should be done with National Securities Depository Limited (NSDL) who are Central Record Keeping Agency (CRA) for NPS.