6. Click Through – The result of "clicking on" an advertisement that links to the advertiser's Web site or another page within the Web site.
7. Page Impressions – The combination of one or more files presented to a viewer as a single document as a result of a single request received by the server.
8. Run-of-Site (ROS) – Refers to a rotation of your ad throughout the website. Under ROS, advertisers do not specify where ads will appear.
14. Publisher Ad Server Ad Serving Request 3rd Party Ad Serving Request Click Through Request Ad Serving Brand Central Impression Count = 1 Website Serving Click Count = 1 Click Through Request Client Website Server