The Schengen Areas visa policy is defined by the European Union and applies to all countries in the Schengen Area as well as other EU member states with the exception of Ireland. Nationals of specified countries are permitted to visit the Schengen Area by air, land, or sea without a visa for stays of up to 90 days during a 180-day period under the visa liberalisation policy. When entering or transiting through the United States, citizens of some foreign nations are needed to hold a visa.
Despite the fact that Bulgaria, Croatia, Cyprus, and Romania are all EU members, they are not yet members of the Schengen Area. However, they have a visa policy that is based in part on the Schengen acquis.