Cookies and privacy on our websites
A cookie is a minute text file that contains data which is placed on your computer by our website each time you visit it. The data contained within these tiny files is read each time your web browser requests a page from our web server. In basic terms it allows our computer to recognise your computer as a machine it has dealt with before. It therefore provides practical benefits to you by making access to our website easier than it otherwise would be.
More details here.