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Illegal immigration refers to immigration across national borders in a way that violates the immigration laws of the destination country. Under this definition, an illegal immigrant is a foreigner who either illegally crossed an international political border, be it by land, sea or air, or a foreigner who legally entered a country but nevertheless overstay their visa in order to live and/or work therein. In politics, the term may imply a larger set of social issues and time constraints with disputed consequences in areas such as economy, social welfare, education, health care, slavery, prostitution, crime, legal protections, public services, and human rights. Illegal emigration would be leaving a country in a manner that violates the laws of the country being left.