Almost at the 11th hour, the UK and EU have struck a Brexit deal that will have many implications for everyday life and the UK's future relationship with other countries.
The full complicated agreement is over 1200 pages long, but here are some of the key points.
Fishermen sort and load trays of salmon heads as they prepare for their next voyage to sea, on the South Pier of Bridlington Harbour fishing port in Bridlington, north east England on December 11, 2020. Photo: AFP / Oli Scarff
Trade
There will be no extra charges on goods (tariffs) or limits on the amount that can be traded (quotas) between the UK and the EU from 1 January.
However, there will be extra checks at borders, such as safety checks and customs declarations, so businesses that rely on transporting goods to and from the EU will need to be ready.
For services, including finance - which is very important to the UK economy - the situation is still slightly unclear. Services will lose their automatic right of access but the UK said the agreement "locks in market access across substantially all sectors".
There will no longer be automatic recognition of professional qualifications such as doctors, nurses and architects.
Travel
UK nationals will need a visa for stays of longer than 90 days in the EU in a 180-day period, and there will be extra border checks for UK travellers.
EU pet passports will no longer be valid.
British travellers will still be able to access emergency health care in the European Union. European Health Insurance Cards, (EHIC) cards will remain valid until they expire. According to the UK government, they will then have to be replaced by a "UK Global Health Insurance Card".
The UK and the EU will co-operate on "fair and transparent rates for international mobile roaming" but there is nothing stopping British travellers being charged for using their phone in the EU and vice versa.
Fishing
The UK becomes an independent coastal state and can decide on access to its waters and fishing grounds.
But EU boats will be able to fish in UK waters for some years to come at least.
Twenty-five percent of the value of their current catch will now become available for UK fishing boats, but there will be a transition period of five-and-a-half years where that is phased in.
After the transition period the UK and EU will regularly negotiate on access to each other's waters.
European Court of Justice
The UK will no longer be bound by judgments made by the European Court of Justice, Prime Minister Boris Johnson said.
Security
The UK will no longer have automatic access to key databases, but should be able to gain access upon request.
The UK will not be a member of Europol - the EU's law enforcement agency - but it will have a presence at its headquarters. This will be similar to the arrangement the US currently has.
Study
The UK will no longer participate in the Erasmus exchange programme - an EU scheme that helps students study in other countries, and in its place will be a new scheme named after the mathematician Alan Turing.
Students at universities in Northern Ireland will continue to participate in Erasmus, as part of an arrangement with the Irish government.
-BBC