Cookies are small text files that the sites visited by users to send their terminals, where they are stored before being re-transmitted to the same sites on your next visit.
Cookies are used for different purposes: execution of authentication information, monitoring sessions, storing information about specific configurations about users accessing the server, the preference store, etc.
Cookies "technicians" are used to make browsing or provide a service requested by the user. They are not used for purposes other and are normally installed by the owner of the website.
Cookies analytics are similar to cookies technicians only if used for optimization of the site by the owner of the site, which may collect aggregate information on the number of users and how they visit the site. Under these conditions the same rules, with regard to disclosure and consent, provided for cookies technicians.
Cookies of SO-CALLED "Third parties" are, instead, set by a website other 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 servers other than the site visited.
Cookies profiling are used to track the user's navigation on the network and create profiles on his tastes, habits, choices, etc. These cookies can be transmitted to the user's terminal advertising messages in line with the preferences already expressed by the user in navigating online.
These cookies do not require the prior consent of the user, who can still deny their use by changing at any time, as follows, its preferences browser to reject them or to be informed when they are used: