Refugees and Displacement

Four categories, four legal realities

Forced displacement describes people who did not choose to leave but were compelled to flee. International law and humanitarian practice sort them into categories that carry very different rights, and precision here matters because the label attached to a person shapes what protection they can claim.

A refugee, under the 1951 Refugee Convention, is someone who is outside their country of nationality owing to a well-founded fear of being persecuted for reasons of race, religion, nationality, membership of a particular social group, or political opinion, and is unable or unwilling to return. Two features are essential: the person has crossed an international border, and the reason is persecution on one of those five grounds.

An asylum-seeker is a person who has applied for refugee status and is waiting for a decision. UNHCR stresses that refugee status is declaratory: a person does not become a refugee because a government recognizes them; they are a refugee the moment they meet the definition, and recognition simply confirms it. For that reason, asylum-seekers should be treated as refugees until it is determined that they are not.

An internally displaced person, or IDP, has been forced to flee, often for the very same reasons as a refugee, but has not crossed an international border. IDPs remain inside their own country and, in law, under their own government's jurisdiction. They are the largest displaced group worldwide.

A migrant, by contrast, is an umbrella term that the International Organization for Migration notes has no agreed definition in international law. It covers people who move, within a country or across a border, for many reasons, frequently including work, study, or family. The key distinction is that being a migrant, on its own, does not entitle a person to international protection, whereas refugee status does. Using migrant loosely to describe people fleeing persecution can obscure that they are legally entitled to protection.

The 1951 Refugee Convention and non-refoulement

The Convention Relating to the Status of Refugees was adopted in 1951, in the aftermath of the Second World War, and originally applied mainly to people displaced by events in Europe before that date. The 1967 Protocol removed those temporal and geographic limits, turning the definition into a universal one that applies regardless of where or when displacement occurs. Together the 1951 Convention and its 1967 Protocol form the core of international refugee law.

The cornerstone of the Convention is the principle of non-refoulement, set out in Article 33. It provides that no state shall expel or return, refouler in French, a refugee in any manner whatsoever to the frontiers of territories where their life or freedom would be threatened on account of the same five grounds in the refugee definition. In practice this means a person with a valid claim cannot simply be pushed back into danger while, or before, that claim is assessed. The Convention allows narrow exceptions, for example where a refugee is a serious danger to the security of the host country, but the protection is broad and widely regarded as binding even on states that have not signed the Convention.

Some regions extend the definition. The 1969 OAU Convention in Africa and the 1984 Cartagena Declaration in Latin America recognize people fleeing generalized violence, external aggression, or events seriously disturbing public order, not only individualized persecution. These broader instruments coexist with the 1951 framework rather than replacing it.

Why people are forced to flee

The drivers of forced displacement cluster into a few recurring causes. Armed conflict and war are the largest: at the end of 2024 the biggest displacement situations were Sudan, Syria, Afghanistan, and Ukraine, according to UNHCR. Persecution and serious human rights violations, targeting people for their identity, beliefs, or political activity, are the second, and they sit at the heart of the legal refugee definition. Generalized violence and the collapse of public order push others across borders even when no single group is singled out.

Disasters and, increasingly, the effects of climate change are a growing driver. Floods, droughts, and storms displace large numbers of people every year, and slow-onset changes can make places gradually unlivable. An important legal subtlety follows: people who flee a disaster or a changing climate usually do not fit the 1951 Convention definition, because they are not being persecuted on one of the five grounds. Many become IDPs, and those who cross a border are often classified as migrants rather than refugees. This gap between the causes of modern displacement and the categories of mid-twentieth-century law is an active area of policy debate, and this lesson describes it rather than resolving it.

The scale, and how to read the numbers

Displacement figures move constantly, so they should always be quoted with a date and an attribution. UNHCR, the UN Refugee Agency, is the standard source. In its Global Trends report covering 2024, released in June 2025, UNHCR estimated that about 123.2 million people were forcibly displaced worldwide at the end of 2024, roughly one in every 67 people on the planet.

The composition of that total corrects a common misconception. The largest group is not refugees who have reached wealthy countries but internally displaced people, about 73.5 million, close to 60 percent of the total, who remain inside their own borders. Refugees and others in need of international protection numbered around 42.7 million, and several million more were asylum-seekers awaiting decisions. UNHCR also reports that most refugees are hosted by low- and middle-income countries near the crises they flee, not by the wealthiest nations. When you encounter a displacement statistic, check three things: the year it refers to, who is included in it, and who published it. A precise number without a date is a warning sign.