A cookie is a small file which is saved on your device when you visit a website. These files contain information relating to user preferences and help improve or customise the user experience on that site.
Most modern web browsers allow the user to control cookies stored on their device. Please find below links to their sites for more information.Google Chrome
More detailed information about what a cookie is and how to control, delete or block them can be found at allaboutcookies.org.