For autotagging, what parameter does Google Ads include in the destination URL?

When autotagging is enabled in Google Ads, it automatically appends a unique parameter, gclid=, to the destination URL of your ads. This parameter is a Google Click Identifier and is crucial for Google Analytics to accurately attribute ad clicks to specific campaigns, ad groups, keywords, and other Google Ads dimensions. Without gclid=, Analytics would not be able to link the user's session back to the specific Google Ads click that brought them to your site. The other options are incorrect: adid= is not a standard autotagging parameter used by Google Ads. urlid= is not a standard autotagging parameter used by Google Ads. utm= parameters (e.g., utmsource, utmmedium, utmcampaign) are used for manual tagging, not autotagging. While they serve a similar purpose of tracking campaign data, autotagging uses gclid= for Google Ads integration.