Google Analytics is a powerful tool that tracks and analyzes website traffic for informed marketing decisions.
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_ga_
ID used to identify users
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_gid
ID used to identify users for 24 hours after last activity
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_gat
Used to monitor number of Google Analytics server requests when using Google Tag Manager
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_gac_
Contains information related to marketing campaigns of the user. These are shared with Google AdWords / Google Ads when the Google Ads and Google Analytics accounts are linked together.
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__utma
ID used to identify users and sessions
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__utmt
Used to monitor number of Google Analytics server requests
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__utmb
Used to distinguish new sessions and visits. This cookie is set when the GA.js javascript library is loaded and there is no existing __utmb cookie. The cookie is updated every time data is sent to the Google Analytics server.
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__utmc
Used only with old Urchin versions of Google Analytics and not with GA.js. Was used to distinguish between new sessions and visits at the end of a session.
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__utmz
Contains information about the traffic source or campaign that directed user to the website. The cookie is set when the GA.js javascript is loaded and updated when data is sent to the Google Anaytics server
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__utmv
Contains custom information set by the web developer via the _setCustomVar method in Google Analytics. This cookie is updated every time new data is sent to the Google Analytics server.
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__utmx
Used to determine whether a user is included in an A / B or Multivariate test.
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_ga
ID used to identify users
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_gali
Used by Google Analytics to determine which links on a page are being clicked
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