A credit score is a three-digit number calculated to indicate your creditworthiness. The higher the score, the more creditworthy you are to a lender. A credit score is calculated from the information in your credit report and considers your on-time payments, the length of your payment history, your mix of different types of credit accounts, and other such factors. It is important to know that your score does not take your age, income, employment, marital status, or your account balances into account.
You can learn more about credit scores and scoring models from the Consumer Financial Protection Bureau website: https://www.consumerfinance.gov/ask-cfpb/what-is-a-credit-score-en-315/.