Cookies are small files that websites write onto your computer's hard drive during your first visit. Imagine a cookie as an ID card that is uniquely yours. Their job is to signal a subsequent return to the site. Although it is possible to misuse them in cases where they contain personal data, cookies are not in themselves malicious. Most websites use cookies. Cookies tell us how many pages you have visited, which allows us to understand what type of information interests you. This allows us to offer you more content that interests you and less content that you does not. Cookies can help you be more effective. Have you ever put an item into your basket on an online store and returned a few days later to see your item still in the basket? This is an example of the work of cookies. Cookies allow you to: store preferences and names of users; register products and services, and customise pages. But if you have never created a profile nor left personal information on a site, the server simply knows nonetheless that someone with your cookie has returned to the website. This is the extent of the knowledge of the cookie.