A cookie is a text file stored on your computer which contains information that can be used to track your movement between pages on a website. Without them, every page you visit would behave as if it was your first time on the website and not take into consideration any actions on previous pages.
Cookies fall into four categories:
This will delete the viewed_cookie_policy cookie on this website. It will appear that nothing has happened – what has actually happened is that the cookie has been deleted, and when you re-load the page the cookie bar will be shown again.