Deportation is formally removal of a person or persons from the United States by the federal government for violations of a number of immigration or criminal laws. Depending on the circumstances surrounding the deportation, the alien who has been deported may lose the right to return to the United States in the future, even as a visitor.
Deportation, sometimes called "removal" is a legal proceeding. Any alien involved in this proceeding has legal rights before being removed from the country; this includes the right to an attorney. The alien may challenge the deportation order on procedural or constitutional grounds.