A "cookie" is a small text file created by some websites on the user's computer when he accesses a particular site, with the purpose of storing and transporting information. Cookies are sent by a web server (which is the computer on which the visited website is running) to the user's browser (Internet Explorer, Mozilla Firefox, Google Chrome, etc.) and stored on the latter's computer; they are then re-sent to the website at the time of subsequent visits. Some operations could not be performed without the use of cookies, which, in some cases, are therefore technically necessary. In other cases the site uses cookies to facilitate and facilitate navigation by the user or to allow them to take advantage of specifically requested services. Cookies can remain in the system for long periods and can also contain a unique identification code. This allows the sites that use them to keep track of the user's navigation within the site itself, for statistical or advertising purposes, i.e. to create a personalized profile of the user starting from the pages that he/she has visited and to show him/her or then send them targeted advertisements.