A credit rating agency rates the creditworthiness of issuers of debt and their ability to pay back debt. The major credit rating agencies are S&P, Moody's, and Fitch. They rate instruments like bonds, CDs, and securities issued by governments, corporations, and other entities. High credit ratings lead to lower interest rates for issuers. In India, major credit rating agencies are CRISIL, ICRA, CARE, and FITCH which provide rating services, information services, and advisory services. They rate debt instruments, structured finance products, and companies in India.