A credit rating agency (CRA) is a company that assigns credit ratings for issuers of certain types of debt obligations. In most cases, these issuers are companies, cities, non-profit organizations, or national governments issuing debt-like securities that can be traded on a secondary market. A credit rating measures credit worthiness, the ability to pay back a loan, and affects the interest rate applied to loans. (A company that issues credit scores for individual credit-worthiness is generally called a credit bureau or consumer credit reporting agency.