Glossary · Tracking and tech
Sub ID— what it means in affiliate marketing
Extra parameters in an affiliate link that let the affiliate label and later split their own traffic.
Sub IDs are the only reporting dimension the affiliate controls, so they carry whatever the tracker needs: creative, placement, geo, account. Advertisers read them too, which is how a bad placement gets named.
Related terms
| Term | Definition |
|---|---|
| Postback | A server-to-server call that reports a conversion from the advertiser's system to the affiliate's tracker. |
| Tracking | Recording a user's path from click to conversion through a unique identifier. |
| UTM tags | Standard URL parameters — utm_source, utm_medium, utm_campaign — that label traffic for analytics. |
Entry updated 29 July 2026. All 276 terms in one page.
