Almost all websites use cookie technology. A cookie, sometimes also called a cookie, is a small file that saves Internet settings. It gets downloaded through a web browser during the first visit to a website. When you return to the site next time with the same device, the browser can check if a closely related cookie exists (i.e. containing the site's name) and use the information inside the cookie to send back to the site. This allows the sites to sense that the browser has been there on a visit before, and in some cases vary their content to reflect that.