Cookies are files created by websites you visit. Your personal data will be stored in a cookie by the server upon your connection, this data is labelled with an ID unique to you and your computer. 

It authorises your online experience easier by saving browsing information based on your preferences, i.e. your login information and shopping carts which are used to identify your computer as you use a computer network. With cookies, sites can keep you signed in, remember your site preference, and give you locally relevant content. Websites use cookie consent banners to provide transparency to the visitor about how they use and collect user data. If you are uncomfortable with the use of cookies technology, you can change your cookies preferences so that your browser doesn’t accept cookies or accepts them only from limited sources.