An undocumented immigrant is a person who enters or resides in a country without legal permission or proper documentation. This can happen when someone crosses a border without authorization or overstays a visa. Undocumented immigrants often seek better opportunities, safety, or family reunification. In many countries, including the United States, undocumented immigrants may face challenges such as limited access to healthcare, education, and legal employment. They often live in fear of deportation and may contribute to the economy through various jobs, despite their lack of legal status.