The category performance report is a 30 day moving snapshot of your search volume. It will let you know what your most popular search terms are, as well as your most profitable. You may re-run the report to sort it by the varying criteria.
Keyword: The Category searched
Total Searches:Number of searches in the last 30 days
Total Clicks: Number of paid clicks in the last 30 days
Gross Revenue: The total revenue produced by those clicks
Gross PPC: The average Price Per Click for this keyword
Net Revenue: The net revenue (after affiliates have been paid)
Net PPC: The net average Price Per Click