After 1,059 days in charge, Prime Minister Theresa May is stepping down as leader of the ruling Conservative Party.
She will stay on as prime minister until a replacement is found but that search is well under way.
So, why is Mrs May going and what does it mean for the future of the UK?
Why is Theresa May stepping down?
During her time as prime minister, Theresa May failed to complete her most important task: delivering Brexit.
UK voters had backed ending membership of the European Union, by 52% to 48%, in June 2016.
Two and a half years later, a plan agreed by the UK and the EU was delivered, setting out how Brexit would happen.
But some Conservative MPs felt it was a “bad deal” and