The Schengen area consists of 26 member states:
Austria, Belgium, Denmark, Germany, Estonia, Finland, France, Hungary, Italy, Greece, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Poland, Portugal, Sweden, Slovakia, Slovenia, Spain, Czech Republic, and the non-EU countries Members Switzerland, Norway, Iceland and Liechtenstein.
The agreement not only includes easier entry and exit (elimination of border controls) between these countries, but also regulates cooperation between the police of the different countries. There is also increased cooperation in the court system, for example to simplify extraditions.