Visa policy in the European Union in the context of "Visa policy of Ireland"

The Schengen Agreement (English: /ˈʃɛŋən/ SHENG-ən, Luxembourgish: [ˈʃæŋən] ) is a treaty which led to the creation of Europe's Schengen Area, in which internal border checks have largely been abolished. It was signed on 14 June 1985, near the town of Schengen, Luxembourg, by five of the ten member states of the then European Economic Community. It proposed measures intended to gradually abolish border checks at the signatories' common borders, including reduced-speed vehicle checks which allowed vehicles to cross borders without stopping, allowing residents in border areas freedom to cross borders away from fixed checkpoints, and the harmonisation of visa policies.

In 1990, the Agreement was supplemented by the Schengen Convention which proposed the complete abolition of systematic internal border controls and a common visa policy. The Schengen Area operates very much like a single state for international travel purposes with external border controls for travellers entering and exiting the area, and common visas, but with no internal border controls. It currently consists of 29 European countries covering a population of over 450 million people and an area of 4,595,131 square kilometres (1,774,190 sq mi).