The UK has agreed a deal with the European Union over Gibraltar's status after Brexit.
Talks on rules governing the border of Spain and the British Overseas Territory have been ongoing since the UK left the EU in 2020.
The UK said the agreement would avoid the need for checks on people and goods crossing the Gibraltar-Spain border.
For travellers arriving at Gibraltar airport, passport checks will be carried out by Gibraltar and Spanish officials.
This is similar to the system in place for Eurostar passengers at London's St Pancras station, where travellers pass through both British and French passport control before boarding international trains.
