Cookie is a short text file, which web page send to browser.
It allows the web page to store information about your visita, such as your prefered language and other settings.
Your next visit can be then easier and more productive. Cookies are important.
Without cookies, web browsing would be much more difficult.
Cookie files serve to lot of purposes. We use them for example to persist your search settings, to login to your account, to watch number of visitors on our pages, to ease registration and to protect your data.