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FICO score is a three-digit number, in the range of 300-850 range, that tells lenders whether you are potentially good with returning the credit that you borrow.
When you apply for new lines of credit, the potential creditor will use your FICO score to make a decision of whether your loan/ line of credit should be approved. If it approved, then for what amount, duration and interest rate? Great credit repayment behaviour, a good credit mix and history are some of the reasons potential creditors feel comfortable giving credit on.