The United Kingdom has officially left the European Union after 47 years of membership and the move comes more than three years after it voted for Brexit in a referendum.
The historic moment, which happened at 23:00 GMT, was marked by both celebrations and anti-Brexit protests.
The transition period of UK’s exit will end on December 31, 2020.
Candlelight vigils were held in Scotland, which had voted to stay in the EU, while supporters celebrated in London’s Parliament Square.
Britain premier Boris Johnson hailed the move and vowed to bring the country together.
“For many people this is an astonishing moment of hope, a moment they thought would never come.”, the prime minister said in a social media post.
“And there are many of course who feel a sense of anxiety and loss.
“And then of course there is a third group – perhaps the biggest – who had started to worry that the whole political wrangle would never come to an end.
“I understand all those feelings and our job as the government, my job, is to bring this country together now and take us forward.”
He said that “for all its strengths and for all its admirable qualities, the EU has evolved over 50 years in a direction that no longer suits this country”.
“The most important thing to say tonight is that this is not an end but a beginning,” he said, and “a moment of real national renewal and change”.
Most EU laws will continue to be in force – including the free movement of people – until 31 December, when the transition period comes to an end.
What does it mean for Britain?
UK PM Boris Johnson will not be entitled to attend EU Council summits and will have to be specially invited for him to attend it.
UK will be free to set-up its own trade policies with other countries including India, which it wasn’t allowed as part of the European Union. Brexit supporters argue that having the freedom to set its own trade policy will boost the UK’s economy.
Freedom of movement will continue to apply during the transition, so UK nationals will still be able to live and work in the EU as they currently do.
The UK passport which had adopted the burgundy cover in 1988 will return to blue and gold print. Existing burgundy passports will continue to be valid.