[Text on screen]: The Brexit case explained in plain English.

The High Court just ruled that only Parliament can decide when Brexit will be triggered.

The judgment was all about fundamental rights.

The UK Supreme Court will hear an appeal in December.

There were some strong reactions to the ruling.

Here’s everything you need to know:

The story starts in June when the UK voted to leave the European Union (EU). Any country that wants to leave needs to trigger something called ‘Article 50.'

That country leaves the EU exactly two years after Article 50 is triggered. The legal question is who gets to pull the trigger.

Theresa May says she can press the button without asking members of Parliament.

But the judges said that was wrong and Parliament has to give approval first.

Here’s the thing: Leaving the EU could mean people in the UK lose important rights.

Workers’ rights like maternity leave and not being discriminated against, and rights to free movement across Europe.

The judges said that those rights couldn’t be taken away without Parliament’s approval.

They also said the June referendum was advisory only. Parliament has to be involved.

The case will now go to the UK Supreme Court. All 11 Justices will decide who can trigger Brexit. And nothing less than our fundamental rights are at stake.

What could be more important than that?