_utma
Typically, this cookie is written in the browser at the time of the first visit to the site from that particular browser. If the cookie has been deleted by the browser operator and then the browser visits the site again, a new cookie _utma is written and marked with another unique ID. This cookie is used to establish unambiguously who are the visitors of the site are and is updated at each page view. Moreover, it is marked by a unique ID that Google Analytics uses as an additional measure of protection to ensure both the validity and the accessibility of the cookie.
_utmb
This cookie is used to establish and continue a user session with the site. When a user views a site page, the Google Analytics code attempts to update the cookie. If it does not find it, it writes a new one and establishes a new session. Whenever a user visits another page of the site, the cookie is updated with a 30-minute expiration, thus continuing a one-time session of the user’s activity at 30-minute intervals. The cookie expires when a user pauses on a page of the site for more than 30 minutes. To change the default length of a user session, you can use the _setSessionCookieTimeout method.
_utmc
This cookie was used by the ga.js tracking code to determine the session status.
_utmz
This cookie stores information on the referral used by the visitor to reach the site, for example a direct method, a referral link, a search within the site or a campaign such as an advertisement or a link in an e-mail message. It is used to calculate search engine traffic, advertising campaigns and page navigation within the site. The cookie is updated at every page view within the site.
_utmt
This cookie stores information to determine the type of the request. It lasts 10 minutes.
_ga
The javascript library Google Universal Analytics uses cookies to distinguish anonymously single users and to manage the frequency of requests to the server. Duration: 1 year from set / update.
To disable Google Analytics cookies visit this page: https://tools.google.com/dlpage/gaoptout?hl=en
For an appropriate information on the use of cookies by Google, the service provider / dealer, we suggest you visit the following link: https://support.google.com/analytics/answer/6004245?hl=en
Google Inc. provides a plugin for some browsers that prevents detection of the cookies of Google Analytics service.
For more information visit the link: https://tools.google.com/dlpage/gaoptout?hl=en
