This is the number of clicks we expect that this domain got from their search ads in the past month. Since we know the domain’s average ad position on each of their keywords, and we can tell how many people searched each keyword, we use the click-through-curve to get a good idea of how many clicks those ads delivered.
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In the PPC Overview, the PPC click details are loaded in the chart each month so you can track how the number of clicks changed over time.
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Also shown as "Monthly Paid Clicks (Domain Rollup)"