A cookie is a file generated by a web server containing an identifier (a string of letters and numbers) that are stored on a user’s computer by the browser whilst they are on a website. The identifier is then sent back to the server each time the browser requests a page from the web server. The main purpose of a cookie is for a website to remember when your device has accessed pages on a website for the sole purpose of enhancing your web browsing experience.
Cookies that we use
Most browsers allow you to refuse to accept cookies and to delete cookies. The methods for doing so vary from browser to browser, and from version to version. You can however obtain up-to-date information about blocking and deleting cookies via these links:
https://support.microsoft.com/en-gb/help/17442/windows-internet-explorer-delete-manage-cookies (Internet Explorer)
Please note, blocking all cookies may have a negative impact upon the usability of many websites.