Business earnings after deducting the OPEX, Interest and Income Tax from Revenue:
Net Income = Revenue - OPEX - Interest - Income Taxes
The terms above are calculated for the same accounting period (usually 12 months).
It is the ultimate measure of the Business profitability and only positive Net Income adds value to the Business.
See also
Business / Business Administration / Financial Management / Financial Accounting / Profit and Loss (P&L)