The Domain Naming System, DNS, is one of the internet’s most important components.
It pairs the easy-to-remember web addresses - like bbc.com - with their relevant servers. Without DNS, you’d only be able to access websites by typing in its IP address, a series of numbers such as "18.104.22.168".
More by circumstance than intention, the US has always had ultimate say over how the DNS is controlled - but not for much longer.
It will give up its power fully to Icann - the Internet Corporation for Assigned Names and Numbers - a non-profit organisation.