Cookies are small text files that websites place on the computers and mobile devices of people who visit those websites.
These files are then read by the website each time you return to the site. These text files allow a website to remember your device and how you interacted with the website, which is useful for a number of different purposes. For example, cookies can be used to remember username and password information so that you don’t have to re-enter all of your login information every time you visit a site you frequently log in to.
Other functions of cookies are to provide custom advertising to users based on searches and personal interests, as well as site performance cookies that enhance website use by remembering things such as custom video streaming or volume settings you have selected while using the website in the past.
More information about cookies and European legislation regarding cookies can be found at the European Union's Web portal, here.