| Ads shown (served) |
Ads delivered into a slot for a real visitor. Rejected requests and likely bots are excluded. |
| Loaded (measurable) |
Ads shown that the embed placed on the page, so it could start checking whether they were seen. |
| Actually seen (viewable) |
Ads shown that were really on screen: at least half the ad (30% for large ads) visible for 1 second in an active tab. This is part of ads shown, not an extra count. |
| Clicks |
Unique clicks. Repeat clicks from the same visitor count once; dashboards also show the total including repeats. |
| Click rate (CTR) |
Clicks ÷ ads shown, as a percentage. |
| Seen rate (viewability) |
Actually seen ÷ loaded, as a percentage. A low seen rate usually means the slot sits below the fold. |
| Fill rate |
Share of ad requests that got an ad: ads shown ÷ (ads shown + empty slots). |
| Empty slots (no-fill) |
Valid requests where no eligible ad was available, so nothing was shown. |
| Rejected requests / likely bots |
Malformed, blocked, or bot-like traffic. Tracked separately and never counted in any number above. |
| Remaining credits |
Total shows minus ads shown. Never goes below zero. |