Migration refers to directed, regular, or systematic movement of a group of objects, organisms, or people.
This specifically excludes "temporary travel abroad for purposes of recreation, holiday, visits to friends and relatives, business, medical treatment or religious pilgrimage".[1] The UN has also directly linked international immigration into one country with emigration from another.
The modern concept of immigration is related to the development of nation-states and nationality law and/or citizenship law. Citizenship in a nation-state confers an inalienable right of residence in that state, but residency of non-citizens is subject to conditions set by immigration law
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