Your credit score is a number assigned to you based on your worthiness to handle debt. If you borrow money and use a credit card, you will have a credit score.
A good credit score is recorded and kept by three different companies or bureaus: Equifax, Experian, and Transunion. They may vary a little but the majority of the time, they are close enough.
Credit Sesame is a company that deals with all things credit. From information on credit cards to loans of all kinds. But for me, most importantly, they give you those free credit reports and monitor your credit for signs of identity theft.