A cookie is a small text file that is stored on your computer when visiting a website. This text file stores information that can be read by the website when visiting it again at a later date. Some of these cookies are necessary because otherwise, the site is unable to function properly. Other cookies are convenient for the visitor: they remember your username in a secure way as well as your language preferences, for example. Cookies mean that you do not need to fill out the same information each time you visit a website.