A foreign worker is a person who works in a country other than the one of which he or she is a citizen. Migrant workers may follow work within their own country or between countries, depending on which definition is used. Some foreign workers are present temporarily and legally through a guest worker program in a country with more preferred job prospects than their home country. Some are illegal aliens. Foreign workers temporarily reside in the country in which they work, and will often send most or all wages earned back to their country of origin.