What is the Stormont Brake?published at 11:45 Greenwich Mean Time 22 March 2023
This is the key part of the deal MPs will vote on this afternoon.
Under the previous deal, some EU laws still applied in Northern Ireland. However, politicians at Stormont had no way of influencing them.
The new agreement introduces a "Stormont brake".
This would allow the Northern Ireland Assembly - which creates laws in Northern Ireland - to object to new EU rules.
The process would be triggered if 30 Northern Ireland politicians from two or more parties sign a petition.
The brake could not be used for "trivial reasons" and would be reserved for "significantly different" rules.
Read more detail on the Stormont Brake here.