Cookies are small files that the website stores on your computer's hard drive.
Danish websites are obliged to inform the user that the web site will store cookies on the user's computer / mobile.
On this web site cookies are used to recover entered data from the user, if the user has changed the web page and returned to the page again with the information entered.
The language selection is also stored in a cookie. Then the next selected webpage read the cookie and turn the language to the same as the previous web page.