We are obliged to tell you if you may employ any non-essential cookies and we must get your explicit permission to store those cookies on your computer, so here we go:
What are cookies?
Cookies are bits of information sent by web servers to web browsers, these bits of information are stored by web browsers. They do not compromise your privacy or security as they store a randomly generated identifying tag on your computer. Each time the browser requests a page from the server this information is then sent back to the server, thus enabling a web server to identify and track web browsers.
Two kinds of cookies are normally used: persistent and session. Session cookies are removed from your computer when the browser is closed, but persistent cookies are stored on the computer until you delete them, or until the expiry date is reached.