A credit score is a three-digit number in a range from 300 to 850 that is determined by your credit history. Lenders use it to gauge your ability to pay back a loan.
While a "good" credit score is typically considered to be 670 and up, it's important to know that there are several different credit scores. The two main scores are the FICO score and the VantageScore, though the FICO Score is the preferred choice of most vendors. Many companies use one of these to determine creditworthiness.