This conclusion presents some closing thoughts on the key concepts discussed in the preceding chapters of this book. The book shows that the ‘migration crisis’ of 2015–2016 brought about significant change, as asylum-seekers and refugees were eventually securitized through their association with terrorists. It discusses the evolution of asylum and migration policies in Europe outside the framework of the European Union (EU) and explores the evolution of the EU asylum and migration policy from the entry into force of the Treaty of Maastricht onwards, when the EU acquired legal competence on these matters. Integrating practices into the framework has also made it possible to analyse through security lenses cases that would fall outside the remit of the Copenhagen School’s framework, because they are not characterised by securitizing speech acts. European integration is making large inroads into areas of security. At the same time, the concept of security is increasingly manifesting itself in the process of European integration.