Definition
The pressures driving migration will also multiply and flows will come from different parts of the world as the effects of population growth, widespread tensions and climate change take hold.
The refugee crisis, which saw 1.2 million people coming to Europe in 2015, is of a scale unprecedented since the Second World War.
This has led to a contentious debate about solidarity and responsibility among the Member States and fuelled a broader questioning of the future of border management and free movement within Europe.