Throughout the history of mankind, people around the world have left their homes, fleeing armed conflict, persecution, poverty or simply seeking better opportunities. Migration can be voluntary or involuntary, but most of the time a combination of choices and constraints lead some to leave, while others stay behind. What needs do people have while on the road? Are those needs different based on the reason for leaving home? What distinguishes someone who is displaced internally from someone who has crossed an international border? How can humanitarian actors, States and the international community best protect and assist those who flee, whether within their own State, while in transit, or in the destination country? This edition of the Review attempts to unpack and address these and other related questions, while providing insights into different humanitarian approaches to the needs and vulnerabilities of migrants and internally displaced persons.