Moody's Investors Service is a global credit rating agency that provides assessments of the creditworthiness of borrowers, including governments and corporations. Founded in 1909, it helps investors make informed decisions by evaluating the risk associated with various debt securities. Moody's ratings range from high-quality investments to those considered high-risk. The agency uses a standardized rating scale, with letters such as Aaa, Aa, A, Baa, Ba, B, Caa, and C to indicate the level of risk. Investors and financial institutions rely on these ratings to gauge the likelihood of timely repayment, influencing investment strategies and market dynamics.