While on a shopping spree, you open credit-card accounts at several of your favorite department stores to snap up discounts of 10% or 15%. You’re saving a bundle, but you may be chipping away at your credit score.

CoreLogic and FICO partnered last year to offer lenders an alternative credit score for more predictive scoring, which includes data previously not used in credit scoring, from a borrowers cell phone bill, utilities, payday loan activity, to child support judgments, evictions, property tax liens, the status of homeowner’s association dues, whether or not a borrower is underwater on their current home, or whether a borrower owns other properties that credit agencies typically miss.

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.

Most people can get confused when it comes to checking their credit scores. Consumers wonder which credit score should they check, what’s the best credit score website and are credit scores really free? These questions are asked often, but rarely do people find the right answers.