GCLID stands for Google Click Identifier, which is a unique tracking parameter that Google uses to transfer information between your Google Ads account and your Google Analytics account.

This parameter is used by Analytics to enable information about a particular user's session. It is also used by ClickGUARD to identify individual ad clicks.

GCLID is being included in the final URL of your ads as a result of the "auto-tagging" option being turned on. Read more about this here.

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