A cookie is a small file that stores Internet settings. Nearly all websites use cookie technology.
This technology is downloaded by your internet browser the first time you visit a website. The next time you access this website from the same device, the cookie and the information stored in it is either sent back to the site that generated it (first-party cookie) or to a different website to which it belongs (third-party cookie). This enables the website to recognise whether you have already accessed the site through this browser and, in many cases, it may then vary the content displayed.
Some cookies can be extremely useful, because they improve the user experience when you return to a site you have already visited several times. As long as you use the same terminal and the same browser, cookies will remember your preferences for the site, for example, and make the offers displayed more relevant to your personal interests and needs.