A credit score is a measure of risk used to assess an individual's credit worthiness. Credit scores are generated from statistical models that weigh several factors in a person's credit record, like bill-paying history, the number and type of accounts, late payments, collection actions, outstanding debt, and the age of accounts. A credit scoring system awards points for each factor. A total number of points make up a credit score. This score helps predict how likely it is that an individual will repay a loan and make the payments on time.
The most common credit score used today is the FICO score. Each of the three credit bureaus calculates a FICO score and makes those scores available to lenders and creditors that want to understand the risk they are taking if they decide to lend money, extend credit, or even waive a deposit.
Credit Scores are somewhat confusing because the credit bureaus sell FICO credit scores under different names. Each of the three credit reporting agencies collect information differently from one another and converts data into credit scores differently. Therefore, you have three different credit scores.

The bureaus also sell their own, very different credit scores. FOr example, Experian has a scoring product called the PLUS score which is different than a FICO score. The three credit-reporting companies also jointly introduced another credit score, called VantageScore to compete with FICO's score.
A FICO score is one type of credit score. Any credit score obtained using the Fair Isaac formula is called a FICO score. FICO scores are the credit scores most lenders use to determine your credit risk. Your FICO score is the most important factor in determining what rate you will pay when you borrow money. The higher you improve credit score the more room you have to negotiate a lower interest rate. FICO scores range from 300 to 850. The score that a lender will accept depends on the type of loan you're applying for.

Though Fair Isaac does not reveal the details of their formula, it is largely based on five factors; Payment History, Amount Owed, Length of Credit History, Recent Inquiries and Types of Credit in use.
How a FICO Score Breaks Down

You can get a general picture of whether you have good credit or bad credit from any of the credit scores below. Keep in mind, these scores will be different than your FICO scores and different from each other.
Your credit report drives all the numbers in your credit scores, so if you improve credit report it will make all your credit scores go up.