---
title: Ad Analytics
description: "The Ads section under Analytics shows how ads in your video player perform: how many ads were requested and delivered, who saw them, which errors occurred, and how viewable your ads were. "
---
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3. [Analytics](https://helpdesk.target-video.com/advertising-reports-analytics?hsLang=en#analytics)
# Ad Analytics
## Understanding the Ads reports
The **Ads** section under **Analytics** shows how ads in your video player perform: how many ads were requested and delivered, who saw them, which errors occurred, and how viewable your ads were.
### Overview
The Overview report compares **Ad requests vs. Impressions**:
- **Ad requests** – how many times the player asked for an ad.
- **Impressions** – how many ads were actually shown.
The difference between the two shows how many requests did not result in an ad. This is normal to some degree, because not every request gets filled. A large gap can point to low demand or technical problems, which you can check in the **Errors** report.
The report shows a total chart first, followed by the same data split by device type: **Mobile, Desktop, Smart TV, Tablet** and **Unknown**.
### Operating system
Shows which operating systems your ad impressions came from (for example Android, iOS, Windows, macOS, Linux), in total and per device type.
Below the charts, the **Ad impressions by operating system** table lets you filter by device type and export the data with **Download report**.
### Browser
Shows which browsers your ads were shown in (for example Chrome, Safari, Firefox, Opera).
### Geography
Shows the countries your ad impressions came from. Smaller markets are grouped under **Other Countries**. If a legend has more entries than fit, use the arrows below it to see the next page.
### Errors
Shows which ad errors occurred and how often. Use the dropdown next to **Ad errors on** to choose a device type.
- **The chart** shows the trend of each error type per day. If the legend has more entries than fit, use the arrows next to it.
- **The table** lists each error type with its count per device (Desktop, Mobile, Smart TV, Tablet, Unknown) and in total.
Common error types:
- **Empty VAST response returned** – the ad server answered, but had no ad to deliver. This usually means there was no demand for that request, not that something is broken.
- **There was a problem requesting ads from the server** – the request to the ad server failed.
- **Unable to download or timeout of MediaFile URI** – the ad file could not be loaded in time.
- **VAST redirect timeout reached** – the ad went through too many redirects or took too long to respond.
- **General VPAID error / Unhandled error from VPAID** – the interactive (VPAID) ad creative failed to run.
- **General linear error** – a general error during video ad playback.
- **Non-linear ad creative dimensions do not align with creative display area** – the ad creative does not fit the player size.
A sudden rise in one error type is usually a sign to check your ad tags or contact your demand partner. Use **Download report** to export the data.
### Viewability
Shows your **viewability rate**: the share of ad impressions that were actually visible on the viewer’s screen. Use the dropdown next to **Ad viewability rate on** to choose a device type.
- **The chart** shows the daily viewability rate for the selected period.
- **The table** below lists the rate per day. Switch between **All**, **Desktop** and **Mobile** using the tabs above the table.
A higher viewability rate makes your inventory more valuable to advertisers. If the rate drops, check where the player is placed on the page: players placed lower on the page are often scrolled past before the ad is seen.
Use **Download report** to export the data.
### Prebid analytics and Prebid revenue
If you use Prebid, these reports show how your header bidding performs and how much revenue it generates.
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- [In-content Ad Unit Sticky Feature](https://helpdesk.target-video.com/outstream-ad-units?hsLang=en#in-content-ad-unit-sticky-feature)
- [In-content Ad Unit - Ads](https://helpdesk.target-video.com/outstream-ad-units?hsLang=en#in-content-ad-unit-ads)
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