A credit rating, or score, is a three-digit number that is basically a grading system that gives creditors a quick snapshot of your credit report and insight as to how you pay your bills and manage your credit. A low score can cost you extra money in interest over the life of a loan or, if you have a really low score, can prevent you from getting credit at all. Credit Score Calculations A credit score is also known as a FICO score, which...