Paid reports focus on only paid traffic from search engines and will be particularly useful for SEM / PPC reporting, there are 4 reports available in the Paid Traffic Section:
The Paid Overview report show you the high level information about your website's paid traffic over time.
Paid Search Engines
Paid Search Engines report don't only show you your paid traffic but also grouped them by each search engines, you can visualize these data with a trend chart or a pie chart.
Paid Landing Pages
Paid Landing Pages report shows you all the paid traffic data grouped by landing pages, you can visualize your landing page traffic with the pie chart to see the distribution of landing page traffic across your site.
Paid Keywords report group all your paid traffic by keywords, you will be able to see which paid keywords from what search engines have drove traffic to your website.