The departure of an alien from the United States without an order of removal. The departure may or may not have been preceded by a hearing before an immigration judge. An alien allowed to voluntarily depart concedes removability but does not have a bar to seeking admission at a port-of-entry at any time. Failure to depart within the time granted results in a fine and a ten-year bar to several forms of relief from deportation.
Source: U.S. Citizenship and Immigration Services