What does the personal number on the social security card mean?

The personal number on the social security card is used to identify the cardholder's personal information, which is convenient for querying personal social security records and medical insurance reimbursement. This number is issued by the Social Security Bureau, with 7 or 9 digits. Through the personal number, individuals can query their social security payment records, medical insurance reimbursement and other related information to ensure the accuracy and consistency of personal information.