For NRIs, the NRE (Non-Resident Rupee) account is an Indian rupee-denominated account which offers complete security. NRE accounts can be in the form of savings, recurring deposits, current accounts, or FDs (fixed deposits). The foreign currency you deposit into the NRE account is converted to Rupees.
On the other hand, NRO (Non-Resident Ordinary Rupee) account is a savings or current account held by NRIs to handle the income earned in India. NRO account-holders can both deposit and handle their accumulated rupee earnings easily. But keep in mind that the NRO account enables you to receive funds in both Indian and foreign currency.