Migrant workers exist in modern society. The United Nations defines migrant workers as people who are working for pay in a country of which they are not a national.
There are many examples of the United Nations definition of migrant workers in the United States and abroad. For example, this definition includes people who have immigrated illegally in search of work. In 2013, there were an estimated 11.7 million immigrants living in the United States illegally. Many others also seek work in the United States through official channels, such as work visas. Migrant workers also exist in other countries. For example, the Japanese Exchange and Teaching Programme employs foreigners to teach English in Japan; these teachers are considered migrant workers. Migrant workers are pervasive, and they help form the backbone of economies worldwide.