Different sets of rules are applicable for taxation when it comes to an NRE and NRO accounts.
For NRE: The interest earned on this account is exempt from taxation in India, but it might be subject to tax in your country of residence.
For NRO:  The interest earned on this account is subject to TDS at the rate of 30% in India, along with additional charges (Surcharge and Cess) when the interest is credited to your account. Additionally, the interest earned may also be subject to tax in your country of residence.