Follow the link for an good explanation
http://www.hepatitiscentral.com/hepatitis-c/what-is-viral-load.html
Just wanted to add that your viral load is no indication of the progression of the disease or of the amount of liver damage you may or may not have, it really will only become relevant if you start treatment, then it is used as a gauge to see how well you are responding.
Welcome to the group
Well they mean you have an active HCV infection with a viral load around 3,300,000 IU/ml,