Google Analytics uses 4 persistent and session cookies as detailed in the table below:
| NAME OF COOKIE | DFAULT EXPIRATION TIME | DESCRIPTION |
|---|---|---|
| __utmc: | Session cookie used to detect when the browser window has closed. | End of browser session |
| __utma | Persistent cookie used to store the visitors unique (randomly generated) ID. The cookie is updated every time data is sent to Google Analytics. | 2 years from set/update |
| __utmb: | Persistent cookie used to determine new sessions/visits. The cookie is updated every time data is sent to Google Analytics. | 30 mins from set/update |
| __utmz: | Persistent cookie used to store the traffic source or campaign that explains how the visitor reached your site. | 6 months from set/update |