Cookies are used so that we can see where website visitors come from - for example, after searching on a search engine, clicking on a newsletter etc. – so that we can optimise our website, the effectiveness of our marketing and adapt our activities to the visitors' interests and behaviour.
Cookies delete themselves after a certain number of months (may vary), but they renew after each visit.
To Delete Cookies
See instructions here: http://www.allaboutcookies.org/
How to Avoid Cookies
If you do not wish to receive cookies, you can block them. See instructions here: http://www.allaboutcookies.org/
Google Analytics (Traffic Measurement)
You can disable cookies by Google Analytics here: https://tools.google.com/dlpage/gaoptout?hl=en