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Google Analytics Cookies Explained
__utmb & __utmc
These cookies work in tandem to calculate visit length. Google __utmb cookie demarks the exact arrival time, then Google __utmc registers the precise exit time of the user.
Because __utmb counts entrance visits, it is a session cookie, and expires at the end of the session, e.g. when the user leaves the page. A timestamp of 30 minutes must pass before Google cookie __utmc expires.
Cookie __utmz monitors the HTTP Referrer and notes where a visitor arrived from, with the referrer siloed into type (Search engine (organic or cpc), direct, social and unaccounted). From the HTTP Referrer the __utmz Cookie also registers what keyword generated the visit plus geolocation data. This cookie lasts six months.
Metrics associated with the Google __utma cookie include: first visit (unique visit), last visit (returning visit). This also includes days and visits to purchase calculations which afford ecommerce websites with data intelligence around purchasing sales funnels.
It is used for segmentation, data experimentation and the __utmv works hand in hand with the __utmz cookie to improve cookie targeting capabilities