ROI stands for Return on Investment, which is a financial metric used to evaluate the performance of an investment. It measures the amount of return generated on an investment relative to the investment's cost. ROI is expressed as a percentage and is calculated using the following formula:

ROI = (Gains from Investment - Cost of Investment) / Cost of Investment * 100

Where:

• Gains from Investment: the amount of money gained from the investment

• Cost of Investment: the amount of money invested in the investment

The ROI calculation helps investors to determine the efficiency of their investment and to compare the performance of different investments. A higher ROI indicates a more successful investment, while a lower ROI may indicate a less successful investment or a higher level of risk. However, it's important to keep in mind that ROI is just one of the many metrics that can be used to evaluate investment performance and other factors, such as investment duration and risk, should also be considered.