The agencies of the European Union (formally: Agencies, decentralised independent bodies, corporate bodies and joint undertakings of the European Union and the Euratom) are bodies of the European Union and the Euratom established as juridical persons through secondary EU legislation and tasked with a specific narrow field of work. They are distinct from: international law juridical persons established through primary (treaty) legislation, either as an EU institution (the European Central Bank) or an EU body of other type (such as the European Investment Bank Group entities, the European University Institute, the European Stability Mechanism or the Unified Patent Court) other EU institutions other EU bodies lacking juridical personality, including the advisory bodies, the independent offices held by a single person (European Ombudsman, European Data Protection Supervisor), and the (non-independent, auxiliary) EU inter-institutional services, regardless whether established through treaty or secondary legislation the pan-EU organisational forms which are not considered constituent bodies of the EU or the Euratom, regardless whether possessing juridical personality (European Research Infrastructure Consortium, European political party, European political foundation, European grouping of territorial cooperation, Societas Europaea, Societas Cooperativa Europaea) or lacking it (European economic interest grouping) Overview In contrast to other EU bodies established through secondary legislation, each of more than fifty such entities has its own juridical personality granted by the EU law, recognised across the EU, and in some cases, also across the EEA countries, Switzerland, Serbia, Ukraine, the United Kingdom and Turkey. Nevertheless, in relations with other non-EU third countries, they are in general not recognised as independent entities, thus being considered either parts of the juridical personality of the EU or the Euratom. Some of the agencies, decentralised independent bodies and joint undertakings of the European Union and the Euratom are tasked with answering the need to develop scientific or technical know-how in certain fields, others bring together different interest groups to facilitate dialogue at European and international level. Existing agencies They are divided into the following groups: Decentralised agencies of the EU Distinct from the EU institutions, the agencies of the European Union are specialist bodies set up to advise the Institutions and Member States in areas that affect everyone living in the Union. They are located in member states across the EU, providing services, information, and know-how. The total budget of all the decentralised agencies is approximately 0.8% of the EU's annual budget. Single market agencies Single market agencies (under the