Answer:
DNL - Differential Non-Linearity: For an ideal ADC the output is divided into 2 power n uniform steps each with the width Δ. Any deviation from the ideal step width is the Differential Non-Linearity (DNL). It is expressed as counts. DNL is a function of each ADC's particular architecture.
INL - Integral Non-Linearity: DNL errors accumulate to produce a total Integral Non-Linearity (INL). It is defined as the maximum deviation from the ideal slope of the ADC and is measured from the center of the step. It is expressed as counts. INL is a function of each ADC's particular architecture.
Unlike Offset and Gain Errors which can be compensated by calibration, DNL and INL errors cannot be compensated.