An overstayer is someone who remains in a country after their legal right to stay has expired. There are several synonyms that can be used to describe someone who has overstayed their visa or other form of permission to stay in a country. These include illegal immigrant, undocumented alien, and illegal alien. Other synonyms for overstayer include non-compliant immigrant, non-status person, and outstayer. The term "unauthorized migrant" is also sometimes used to describe an individual who has overstayed their visa or permission to remain in a country. Regardless of the term used, overstaying a visa or permission to remain in a country can result in serious consequences, including deportation, fines, and being barred from future entry.