FICO stands for Fair, Isaacs & Co. They are a data analytics company that first came up with the credit score model in the 50's. Their number, which is called a FICO Score, is a result of a complex algorithm. They have never published what the actual components of the FICO Score is. They are the score almost every lender in the US uses to gauge credit risk. The term "Credit Score" has become synonymous with "FICO Score" but they are not the same. Many companies have come up with a similar algorithm that mimics the score and marketed it as a "Credit Score." Since the name has become synonymous many people think it's the same thing. Some of them are better than others but none of them are perfect. For instance I once checked my actual FICO and Credit Karma at the same time and they were 20 points off. Sometimes it might be the same but it's just because it's the rare instance that both algorithms came up the same. Non-FICO scores are good for checking trends but they are not good for knowing your true FICO. Let's say you're boarderline (640). Credit Karma, or Trans-Union's score (which is NOT a FICO but is oddly fairly widely used by auto lenders) may say you're a 650. So you think hrm I should be able to qualify for that timeshare shop that requires a 640. But your FICO score, that comes from Fair, Isaacs, may say you're only a 635. Then you go apply for that shop and OOOOOOOOPS. Of you may be waiting for your FICO to his 720 before applying for a mortgage because that's a big interest rate break point. Some FAKO might say you're 725 but FICO might say you're 715. OR the other way around. You might be checking Credit Karma and only getting 715 and so you wait on that new home when all along your true FICO is 720. FICO Scores are fairly expensive, if someone is giving you a score and it's a FICO, they're absolutely gonna market it as a FICO. If it has any other name or just says Credit Score, it's a FAKO.
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At the moment only demons come to mind