You've sent for your credit report and paid extra for your credit score. Now what?

If you're like most consumers, you sent for it because you want to know one thing: Do you have good credit or bad? And just how good (or bad) is it?

But instead of a straight answer for your trouble, your report consists of a list of current and past debts plus a number -- your credit score. And, what you qualify for with your score can vary widely.

"Every company sets its own criteria," says Maxine Sweet, vice president of public education for Experian, one of the three major credit bureaus.

At the same time, credit scores are becoming more important in everyday life, as everyone from insurance companies to potential employers have started looking at credit histories and scores.

"More nontraditional types of entities are using credit scores," says Janet Garkey, an editor with the Credit Union National Association's Center for Personal Finance.

And as credit ratings and credit scores take on more meaning and importance in everyday life, so do the misunderstandings and misconceptions.

Myth: There's just one type of credit score
"There are a lot of different scoring models out there," Garkey says. Making it even more confusing, different creditors will look at different factors, she says. "They don't necessarily look at the same thing."

Many larger financial institutions have their own scoring system (which you may or may not ever see). Credit bureaus also have their own separate scoring system, which they sell to creditors and consumers. And in March, the three bureaus banded together to introduce a new numerical rating system.

Dubbed the Vantage score, it runs from 501 to 990 and also gives consumers an academic letter grade. The bureaus have already started marketing the scores to the credit industry and will start selling the scores to consumers later this year, according to Steve Katz, spokesman for TransUnion.

But when it comes to credit scores, one of the most common versions is the FICO score. "It's the 800-pound gorilla," says Craig Watts, public affairs manager with Fair Isaac Corp., the company that pioneered credit scoring and introduced FICO scores about 17 years ago.

A FICO score can range from 300 (very bad) to 850 (very good). The average is about 723, according to Fair Isaac statistics.

Some reassuring news: The majority of consumers have good credit. Forty-five percent of consumers have a score between 700 and 799, and 13 percent score above 800, according to statistics from Fair Isaac.

Just like the SATs, perfect scores are rare. Even though 850 FICO scores do exist, high scores taper off around 825, says Sweet. "You can't get much better -- that's pretty much walking on water," she says.

Now for the rest of the population: 27 percent rank above 600, and 13 percent weigh in above 500. Only 2 percent have scores of 500 or below, according to Fair Isaac numbers.

Myth: There's only one yardstick for assessing what the numbers mean.
Even with the same brand of credit score, different lenders will set different ranges for what constitutes good, better and solid-gold credit.