A cookie is a small text file that is stored on your personal computer or device when you visit a website. Cookies are used by all websites, and have several different functions.
Enable the site to work properly, and keep it secure.
Make the site easier to use.
Improve your use of the site by showing you information that's relevant.
You can change cookie settings through your browser. Each browser works in a different way, so you need to search for 'cookie settings' in your browser's help section to find out how to do this