Immigration in the most simplistic terms means: the movement of people between different countries. The constant movement of peoples has been common throughout human history. However, modern immigration requires long-term, legal, permanent residence.
Short-term visitors and tourists are not considered immigrants. Immigration through international borders that violates the laws of the destination country is considered illegal immigration. An illegal immigrant is a foreign person whom either illegally crossed an international political border or a foreign person who legally entered a country but overstayed their visa in order to live or work in the country. Seasonal labour migration like Mexican fruit pickers, are considered non-permanent immigrants in nature but are still treated as a form of immigration.
This modern concept of immigration is directly related to the development of nation-states and nationality law during the last few hundred years. With the concept of citizenship comes the concept of the nation and national identity. Citizenship, usually the final goal of an immigratn thought naturalization, in a country means that a person has an inalienable right of residence in that state and a right to all the privledges of a natural born citizen. Residency of non-citizens is usually subject to conditions set by a nation’s immigration laws.
According to some statisitcs, 97 percent of people will live in the country in which they were born their whole lives.