Cookies are small text files with non-personal data that websites can store on your computer or mobile device when you visit a website. Cookies are widely used in order to make websites work, or to work more efficiently for visitors, as well as to provide reporting information.
Cookies set by the website owner are called "first party cookies".
Cookies set by parties other than the website owner are called "third party cookies". Third party cookies enable third party features or functionality to be provided on or through the website (e.g. advertising or analytics). The parties that set these third party cookies can recognise your computer both when it visits the website in question and also when it visits certain other websites.