Cookie is a small text-snippet, which is stored from visited website by web-browser to users local device. Cookie stores unique, but anonymous data of users session (visit) on website. Cookie stores data of users device and for example location provided by operator. Cookie does not store users personal data.
Most important reason is user experience. By using cookies we can analyze behavior of unique visitor and segments of visitors by using Google Analytics -measurement tools. By analyzing visitor data we can improve the usability and contents of our our website to better suit your needs.