It is a loan made to a company, typically as growth capital, and is normally repaid at some future date.
Debt capital differs[1] from equity or share capital because subscribers to debt capital do not become part owners of the business, but are merely creditors, and the suppliers of debt capital usually receive a contractually fixed annual percentage return on their loan, and this is known as the coupon rate.
However, sometimes the loan is paid back based on a percentage of the company's monthly revenue instead of a fixed interest rate, such as the case with revenue-based financing.
This means that legally the interest on debt capital must be repaid in full before any dividends are paid to any suppliers of equity.
Equity holders (shareholders) have all rights in the business, but the debt holders have no rights in the business.