They are widely used in order to make websites work, or work more efficiently, as well as to provide information to the owners of the site.
Cookie preference is used to remember a user's choice about cookies on a named website. Where users have previously indicated a preference, that user's preference will be stored in this cookie.
Most web browsers allow some control of most cookies through the browser settings. To find out more about cookies, including how to see what cookies have been set and how to manage and delete them, visit www.aboutcookies.org or www.allaboutcookies. org.
To opt out of being tracked by Google Analytics across all websites visit http://tools.google.com/dlpage/gaoptout