A refugee is a person who leaves his or her home country for fear of persecution. There are approximately 15 to 20 million refugees in the world today. Most refugees come from developing countries where society is in flux or even chaotic. Refugees usually flee to the closest stable country, so different countries see great variation in the number of refugees based on the political climate of their neighbors. Thus, developed countries consistently have a large number of refugees arriving. Refugees are problematic, just as any mass immigration is.