SubId or Tracking ID (TID) is a string of alphanumeric characters generated at the end of a redirect URL, which records a user-defined variable. Often abbreviated as SID, CID, MID, TID, depending on the network and platform, affiliates use subIDs to record and track unique user attributes, traffic sources, banners, and/or link placement.

Synonyms:
Sub ID, Tracking ID, TID, SID

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