UTM Codes (Urchin Tracking Module)
Definition
UTM codes are tags added to the end of URLs to track the effectiveness of marketing campaigns by identifying the source, medium, and campaign name in analytics tools like Google Analytics.
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Translation
The little bits of code you tack onto a URL so you can tell if that click came from your email, a tweet, or that one random blog post—because guessing where traffic comes from is no fun.