Cookies are small text files that are stored by the browser on your computer or mobile phone. Websites are able to read and write these files, allowing them to store things like personalisation details or user preferences. You can think of cookies as providing a “memory” for the website, enabling it to recognise a user and respond appropriately.
You may wish to visit www.aboutcookies.org which contains comprehensive information on how to do this on a wide variety of browsers. You will also find details on how to delete cookies from your computer as well as more general information about cookies. For information on how to do this on the browser of your mobile phone you will need to refer to your handset manual.