What do you mean by ROI term?

Return on Investment (ROI) is a metric — commonly expressed as a percentage — that indicates the efficiency or profitability of an investment, computed by dividing the benefit (return) by the cost of investment. Return on investment (ROI) is a performance measure used to evaluate the efficiency or profitability of an investment or compare the efficiency of a number of different investments. … To calculate ROI, the benefit (or return) of an investment is divided by the cost of the investment.