It takes its name from the City of Schengen in Luxembourg, where the agreement was signed in 1985. It came into force in 1995. The Schengen area currently consists of 26 European countries, with a total population of more than 400 million people and an area of 4,312,099 km2 – from Estonia, Latvia and Finland on the border with Russia in the east to the Portuguese coast in the west. Now that the Schengen Agreement is part of the Community acquis, it has lost to the EU Member States the status of a treaty which could only be amended in accordance with its terms. Instead, changes are made in accordance with the EU`s legislative procedure under the EU treaties.  Ratification by the former signatory states is not necessary to amend or repeal all or part of the previous Schengen acquis.  Acts setting out the conditions for accession to the Schengen area are now adopted by a majority of the EU`s legislative bodies. The new EU Member States do not sign the Schengen Agreement as such, but are required to implement the Schengen rules within the framework of existing EU legislation, which any new entrant must accept. [Citation required] The reason was that investigators had reported security breaches at Schengen`s external border in Greece.
Greece was followed by a package of measures to remedy this situation. The Commission made such recommendations in the following months until they reached the maximum maximum duration of controls under existing legislation in November 2017. The two Schengen agreements have been a major step forward for transport in Europe. Queues would often be one kilometre long and wait for border patrols to sign them, but the agreements helped to stop them. Today, people can enter neighbouring countries without having to present any form of identity card. Of course, airlines always require you to show it for security reasons, but border controls are much easier to navigate and don`t even exist in some cases. In 1990, the agreement was supplemented by the Schengen Agreement, which proposed the total abolition of systematic internal border controls and a common visa policy. The Schengen area operates very similarly to a single state for international travel purposes, with external border controls for incoming travellers and common visas, but without internal border controls.
It currently consists of 26 European countries, with a population of more than 400 million and an area of 4,312,099 square kilometres.  Originally, the Schengen treaties and the rules adopted were officially independent of the EEC and its successor, the European Union (EU). In 1999, the Treaty of Amsterdam incorporated them into EU law, which codified Schengen into EU law and also introduced opt-outs for Ireland and the Kingdom, the latter having taken place since its withdrawal from the EU. EU Member States that do not yet 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 legislation, several third countries are present in this region after signing the agreement. This means that Schengen Member States that were not part of the EU have few formally binding options to influence the development and development of Schengen rules; their options are effectively reduced to approval or exit from the agreement.