What are cookies?
Cookies are small text files stored on your computer by your browser. They are designed to hold data specific to a particular client and website, and are used for many things, such as remembering whether you've visited the site before, so that you remain logged in - or to help us work out how many new website visitors we get each month. They contain information about the use of your computer but don't include personal information about you (they don't store your name, for instance).
Most internet browsers accept cookies automatically, but you can change the settings of your browser to erase cookies or prevent automatic acceptance if you prefer.
These links explain how you can control cookies via your browser:
Internet Explorer: http://windows.microsoft.com/en-us/windows7/how-to-manage-cookies-in-internet-explorer-9
Google Chrome: https://support.google.com/chrome/answer/95647?hl=en