A cookie is a small text file that is sent to your computer's hard drive when you visit a website. When you visit the website again, the cookie allows that site to remember who you are.
A cookie typically contains the name of the website from which it has come, the lifespan of the cookie and a value. The value is usually a unique code that will only make sense to the website that has issued it. Cookies remember things like your colour scheme preferences, what's in your shopping cart or that you've already logged in so you don't need to do it for every page you visit on a website. Cookies can also be used to measure how people use websites and what kind of browsers or devices they're using.
The cookie we use on our website is an X-mapping-kjicghkc cookie. This is a load balancing cookie, and helps to optimise the performance of the site. It contains a random number and expires at the end of your session.
You can learn how to delete and control cookies stored on your computer here.