The European Union and Euratom have agencies, decentralised independent bodies, corporate bodies and joint undertakings which are established as juridical persons through secondary EU legislation and tasked with a specific narrow field of work. They are a part of the wider set of bodies of the European Union and Euratom and are therefore distinct from:international law juridical persons established through primary (treaty) legislation, either as an EU institution or as an EU body of another type other EU institutions other EU bodies lacking juridical personality, including the advisory bodies, the independent offices held by a single person, and the EU inter-institutional services, regardless of whether established through treaty or through secondary legislation the pan-EU organisational forms which are not considered constituent bodies of the EU or Euratom, regardless of whether possessing juridical personality or lacking it