The Copenhagen criteria are the rules that define whether a country is eligible to join the European Union. The criteria require that a state has the institutions to preserve democratic governance and human rights, has a functioning market economy, and accepts the obligations and intent of the EU.
These membership criteria were laid down at the June 1993 European Council in Copenhagen, Denmark, from which they take their name. Excerpt from the Copenhagen Presidency conclusions:
Membership requires that candidate country has achieved stability of institutions guaranteeing democracy, the rule of law, human rights, respect for and protection of minorities, the existence of a functioning market economy as well as the capacity to cope with competitive pressure and market forces within the Union. Membership presupposes the candidate's ability to take on the obligations of membership including adherence to the aims of political, economic and monetary union.
Most of these elements have been clarified over the last decade by legislation of the European Council, the European Commission and the European Parliament, as well as by the case law of the European Court of Justice and the European Court of Human Rights. However, there are sometimes slightly conflicting interpretations in current member states—some examples of this are given below.
During the negotiations with each candidate country, progress towards meeting the Copenhagen criteria is regularly monitored. On the basis of this, decisions are made as to whether and when a particular country should join, or what actions need to be taken before joining is possible.