Rating is the highest credit rating given by a rating company. Rating companies or rating agencies refer to those institutions that rate certain companies or individuals. They will resell the survey results to companies that have or intend to have business with the companies under investigation. Companies with AAA credit rating tend to have good commercial credit, and there is little possibility of overdue repayment or default. For other companies, it is safer to buy company bonds or provide services and goods to the company on credit. Relatively speaking, such a 3A registered company will also have certain preferential loans. AAA refers to the bond or company with the highest credit rating according to Standard & Poor's or Moody's (so-called AAA, because the rating is "AAA").