The Schengen Agreement comprises two separate agreements, ratified in 1985 and 1990 respectively. Together, they have abolished border controls and greatly facilitated transit across Europe. The two individual agreements stated that with the entry into force, on 1 May 1999, of the Schengen Protocol to the Treaty of Amsterdam of 2 October 1997, Schengen cooperation was taken over into EU law, initially only on the basis of an international agreement. Although Switzerland is not a member of the EU, it has strong economic and social relations with many Schengen states due to its position at the heart of Europe and is part of the European Free Trade Association (EFTA) with Iceland, Norway and Liechtenstein (other non-Schengen countries). Switzerland became an integral part of the Schengen area after signing the agreement on 26 October 2004 and starting its implementation on 12 December 2008. Originally, the Schengen Treaties and subsequent rules were officially independent of the EEC and its successor, the European Union (EU). In 1999, they were transposed into European Union legislation by the Treaty of Amsterdam, which provides for Schengen, codified in EU law, while providing for opt-outs for Ireland and the United Kingdom, the latter providing for opt-outs since leaving the EU. EU Member States that do not have an opt-out and have not yet joined the Schengen area are legally obliged to do so if they meet the technical requirements. Although it is linked to EU law, several non-EU countries that have signed the agreement are included in the territory. This situation means that non-Schengen EU states have few formally binding options to influence the development and development of Schengen rules; their options will be effectively reduced to approval or withdrawal from the agreement. However, prior to the adoption of certain new legislation, consultations will be held with the countries concerned.
 Indeed, the Schengen Agreement paved the way for the granting of the Schengen visa. Although this is not part of the initial provisions of the agreement, visitors from the fifteen aforementioned countries now only need a visa for all. The Schengen visa can allow non-members of the European Union to travel freely through the countries participating in the program. The two Schengen agreements were a major step forward for transport in Europe. The queues were often a kilometre long and waited for border patrols to pass them, but the agreements put an end to them. Today, people can count in neighboring countries without having to present any form of identity card. Of course, airlines still require you to mount it for security reasons, but border controls are much easier to navigate and don`t even exist in some cases. . .