Correct Answer: gclid=
Auto-tagging is a setting in your Google Ads account. When enabled, it appends a Google Click ID (gclid) to the end of your URL, before any fragments (also called “named anchors” and indicated by the presence of a #). If your URL already contains a parameter (indicated by the presence of a ?), then the gclid will be preceded by a & instead of a ?.
Read more here: https://support.google.com/analytics/answer/2938246
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