CJEU is the chief judicial authority of the European Union and oversees the uniform application and interpretation of European Union law, in co-operation with the national judiciary of the member states. CJEU also resolves legal disputes between national governments and EU institutions, and may take action against EU institutions on behalf of individuals, companies or organisations whose rights have been infringed.
CJEU's specific mission is to ensure that "the law is observed" "in the interpretation and application" of the Treaties of the European Union. To achieve this, it:reviews the legality of actions taken by the EU's institutions;enforces compliance by member states with their obligations under the Treaties, andinterprets European Union law.
CJEU was originally established in 1952 as a single court called the Court of Justice of the European Coal and Steel Communities (as of 1958 the Court of Justice of the European Communities (CJEC)). The General Court was created in 1988 (known as the Court of First Instance) and the Civil Service Tribunal was created in 2004.