One in every 35 people in the world today is an international migrant, but migration affects far more people than just those who migrate. It has important social, economic, and political impacts at home and abroad. ‘Why migration matters’ shows why the topic of migration is important in the modern world. Migration began when Homo erectus and Homo sapiens moved out from the Rift Valley and colonized Eurasia, a process that has continued for centuries after. There are numerous opportunities for international migration with migrants contributing to economic growth as well as the social and cultural spheres of life. There are also challenges and some concerns, but are they all legitimate?