Glossary · Traffic sources
Popunder— what it means in affiliate marketing
An ad page that opens in a window behind the current one and is noticed when the user closes the tab.
Less immediately irritating than a popup and therefore less often blocked. The click that triggered it was usually meant for something else.
Related terms
| Term | Definition |
|---|---|
| Pop traffic | Traffic from windows that open on top of or behind the page the user was reading. |
| Popup | An ad window that opens over the page content. |
| Clickunder | Pop traffic where the ad page opens on any click anywhere on the host page. |
Entry updated 29 July 2026. All 276 terms in one page.
