Unproofed sourdough starter

I am really new to this sourdough starter thing.  I have two jars of starter perking right along.  One is on the counter and one in the refrigerator.  I have a classic San Francisco sourdough bread recipe that calls for one cup of sourdough starter (unproofed).  What does that mean?  Unproofed?

If anyone has a kind of easy recipe I would love it.    Thanks for your help.

Jan