A cookie is a file that is downloaded to your computer when you access certain web pages. Cookies allow a web page, among other things, to store and retrieve information about the browsing habits of a user or their equipment and, depending on the information they contain and the way they use their equipment, they can be used to recognize to user.
The cookies used for this (_utma, _utmb, _utmc, _utmt and _utmz) are Third Party cookies.
These cookies are used to collect information about user navigation through the site in order to know the origin of visits and other similar data at a statistical level.
Through the following links you can see the details of the cookies used by Google Analitiycs and their purpose: https://developers.google.com/analytics/devguides/collection/analyticsjs/cookie-usage and Google Privacy Center
You can allow, block or delete the cookies installed on your computer by configuring the browser options installed on your computer.
You can see more information about your browser and cookies in the following links:
If you want to reject the analytical cookies of Google Analytics in all browsers, so that your information is not sent to Google Analitys, you can download an add-on that performs this function from this link: https://tools.google.com/dlpage/gaoptout.