Transition isn't leaving, nor is it staying. And some key questions remain unanswered.
The UK will continue to abide by several important EU rules during a 21-month Brexit transition period.
The EU has ruled out any cherry picking from the UK for things like single market access for financial services.
Other EU countries have flexible legal arrangements for their own special territories – something similar for Northern Ireland is not impossible.
A conciliatory tone from the prime minister but Boris Johnson and Michael Gove continue to cause problems.
The Labour leader's vision for a customs union after Brexit is even more optimistic than the one being proposed by Theresa May.
Brexit supporters claim the absence of major repercussions so far is evidence that Brexit is a success. But the UK hasn't left yet.
Unless the UK can strike a deal quickly, British water will no longer be recognised on the coveted European list of recognised mineral sources.
The prime minister conceded that the UK must continue to abide by European Court of Justice rulings, even after Brexit.
Nissan might have promised post-Brexit investment, but leaving the single market and customs union could change everything for the UK.
Why the areas that voted Leave are likely to be hardest hit by Brexit.
What the EU and UK agree and disagree on when it comes to the transition period after Brexit.
It looks like the economists who warned of the potential damage to UK businesses due to Brexit were correct.
For a full 12 months, this prime minister has encouraged and entrenched harmful divisions, particularly over Brexit.
European leaders agree that agreements on issues including the Irish border mean it's time to start moving forward with Brexit negotiations.
Despite apparently over-the-top tactics, Tory whips failed to stop backbenchers from voting against the government. So why wouldn't they do it again?
It depends on whether you look at the politics or the law.
The UK government surprised everyone by meeting the criteria to progress to the next phase of talks. Here's what that actually means.
Theresa May has reached an agreement with the EU that will enable her to proceed to the second stage of Brexit negotiations. Here's what it all means.
British citizens are currently protected by the EU if their government fails them. That will no longer be the case after they leave the union.