Cookies are small text files that the sites visited by users send to their terminals, where they are stored before being re-transmitted to the same sites on your next visit.
Cookies so-called "Third parties" are, instead, set by a other website than the one that the user is visiting. This is because each site can be present elements (images, maps, sounds, specific links to web pages in other domains, etc.) That reside on other servers than the site visited.
Types of cookies
They can be divided into cookies or browsing session, which guarantee the normal navigation and use of the website;
analytics cookies, similar to technical cookies where used directly by the site operator to collect information, in aggregate form, the number of users and how they visit the site;
cookie functionality, which allow the user browsing function of a number of selected criteria in order to improve the service rendered to the same. For the installation of these cookies are not required the prior consent of the user, while it remains subject to the obligation to provide the information.