Wells Fargo customers will have free access to one of their credit scores and credit reports until November 16, 2014 in conjunction with the American Bankers Association’s annual campaign “Get Smart About Credit.” It’s the third year of this promotion, according to a news release from Wells Fargo and it requires customers to visit a local bank branch to obtain their personal access codes for the data.

Credit scores — they’re like report cards for grown-ups. It’s a three-digit “grade” you get on a scale that ranges from 300 to 850. Your score indicates your creditworthiness to potential lenders, banks, landlords, insurance companies, and even to some employers, for instance. I’m sure you know that the higher your score the better.

FICO isn’t the only number used to determine your credit risk — the score that counts is the one your lender uses. There is no single credit score number — the compilers of the widely accepted FICO Credit Score allow lenders to customize their system, so different lenders produce different scores.

A credit score is either a blessing or a curse cast down upon you from the digital cloud. A score of 740 qualifies you for the best interest rate on a conventional mortgage. A score under 640 means ugly interest, and a number under 620 makes it very hard to get a mortgage at all.

A credit bureau gathers information about how consumers use credit. In other words, they collect information from as many consumer financial transactions or inquiries as they can. They then sell access to that combined information to anyone who has a legally-recognized reason (permissible purpose).