Cookies

Site
Name
Lifespan
Purpose
Category
Google
__utma
2 years from set/update
Used to distinguish users and sessions. The cookie is created when the javascript library executes and no existing __utma cookies exists. The cookie is updated every time data is sent to Google Analytics.
Third Party
Google
__utmt
10 minutes
Used to throttle request rate.
Third Party
Google
__utmb
30 mins from set/update
Used to determine new sessions/visits. The cookie is created when the javascript library executes and no existing __utmb cookies exists. The cookie is updated every time data is sent to Google Analytics.
Third Party
Google
__utmc
End of browser session
Not used in ga.js. Set for interoperability with urchin.js. Historically, this cookie operated in conjunction with the __utmb cookie to determine whether the user was in a new session/visit.
Third Party
Google
__utmz
6 months from set/update
Stores the traffic source or campaign that explains how the user reached your site. The cookie is created when the javascript library executes and is updated every time data is sent to Google Analytics.
Third Party
Google
__utmv
2 years from set/update
Used to store visitor-level custom variable data. This cookie is created when a developer uses the _setCustomVar method with a visitor level custom variable. This cookie was also used for the deprecated _setVar method. The cookie is updated every time data is sent to Google Analytics.
Third Party
Google
_ga
2 years
Used to identify visitors (session-id)
Analysis
Third Parties
Name
More Info
Google
https://developers.google.com/analytics/devguides/collection/analyticsjs/cookie-usage