The Schengen Agreement deals with cross-border legal arrangements and the abolition of systematic border controls among the participating countries.
The main purpose of the establishment of the Schengen rules is the abolition of physical borders among European countries.
The Schengen rules apply to most European countries including 22 from the European Union and 3 non-EU members (Iceland, Norway and Switzerland).
Ireland and the United Kingdom were the only EU members that did not sign up to the original Schengen Convention of 1990.
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