What does the credit to debt ratio on your credit report mean?

I have 100% credit and 0% debt on my credit report. What does this mean? Im young 21 and im just really starting to really look at this stuff. And I really have no idea what all this means.

Debt Used divided by Available Credit = Debt Load

Example:
$2,500 of debt charged to a credit card
with a limit of $5,000

$2,500/$5,000 = a debt to credit ratio of 50%

$10,000 of credit card debt with total available limits of $10,000 (means you are maxed out on all your cards!)

= $10,000/$10,000 = 100% debt to credit ratio

If you have 0 debt then your debt to available credit ratio is excellent.