Net interest income, which is the difference between interest earned on assets and interest paid on liabilities, is a crucial measure of profitability for financial institutions. There are several synonyms for this term, including net interest margin, yield on earning assets, interest spread, interest income, and interest revenue. Additionally, the concept of net interest income can be expressed as the interest rate gap, which measures the difference between the average interest rate earned on loans and the average interest rate paid on deposits. Regardless of the term used, net interest income is a crucial metric for any financial institution seeking to optimize profitability and ensure long-term sustainability.