A credit rating is an evaluation of the credit risk of a borrower in terms of their ability to pay back debt. It is conducted by credit rating agencies and results in a standardized score or rating that represents the risk level to lenders. The rating is determined based on factors like the borrower's financial history and trends, revenues, cash flows, management and governance, industry risks, and macroeconomic conditions. Higher credit ratings indicate lower default risk and allow borrowers to borrow at lower interest rates.