summing up an abbreviation is a shortening of a word or a phrase an acronym is an abbreviation that forms a word an initialism is an abbreviation that uses the first letter of each word in the phrase thus some but not all initialisms are acronyms
ROI, or return on investment, is a common business term used to identify past and potential financial returns. Managers and executives look to the ROI of a project or endeavor because this indicates how successful a venture will be.
Return on investment. Your return on investment (ROI) is the profit you make on the sale of a security or other asset divided by the amount of your investment, expressed as an annual percentage rate. For example, if you invested $5,000 and the investment was worth $7,500 after two years, your annual return on investment would be 25%.