Gclid stands for Google Click Identifier. This parameter uses in Google Adwords. Google uses this to track the Adword click and their conversion using Google Analytic.
So gclid is just a parameter which uses with Google Analytic. It’s encoded value. In gclid google store the click time and adwords data which uses in Google Adwords Report.
So gclid is auto-tagging parameter, which is encoded with hash value and that map back to a specific AdWords.
This will be something like this:
gclid can contains the following values:
- Campaign like UTM Source, keywords etc.
- Search Query and many more..