AAA is the highest possible rating that any of the main credit rating agencies may award to an issuer's bonds. AAA-rated bonds have a high creditworthiness since their issuers can easily meet financial commitments and have the lowest default risk. Standard & Poor's (S&P) and Fitch Ratings use the letters "AAA" to indicate bonds with the greatest credit quality, although Moody's uses a slightly different "Aaa" to indicate a bond's top-tier credit rating.

AAA-rated bond issuers typically have little trouble finding investors, despite the fact that the yield on these bonds is lower than on other tiers due to the high credit rating.

A good credit rating reduces the issuer's borrowing costs (or borrower). As a result, corporations with high credit ratings are in a better position to borrow significant sums of money than fixed-income instruments with lower credit ratings. A cheap cost of borrowing also provides organizations with a significant competitive advantage by allowing them to quickly acquire loans to build their businesses.