Cookies are simply small text files stored on your computer when you visit different web pages that store little bits of information. This information can be retrieved when you return to the site. This information could be to provide some personalisation on the site, or so you can store items in an online shopping cart. Cookies are also sometimes used to gather general anonymous visitor data, which helps us improve our website.
If you would like to remove or switch off cookie access in your web browser you can do this changing some settings in your web browser.