GETTY Jean-Claude Juncker is the President of the European Commission

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What is the European Commission? The European Commission - the EU’s executive arm - defines itself as "the heart of Europe, from which the other institutions derive much of their energy and purpose". It is led by the controversial President Jean-Claude Juncker and the College of Commissioners – a group of 28 unelected politicians. Around 34,000 civil servants are employed by the Commission to help it undertake its work.

What does the European Commission do? The Commission has two main roles – to devise policies and to run the day-to-day business of the EU. It is divided into 33 directorates-generals including education, employment, tax and trade. Each is headed by a Director-General, reporting to a Commissioner. WHO IS MARTIN SCHULZ?

PH The College of Commissioners is a group of 28 unelected bureaucrats

The Commissioners are sworn by oath to create legislation which is in the best interests of the EU, and are charged with upholding the EU treaties. Once a law has been devised upon by the Commission, it is put the the European Council and the European Parliament to vote on. After a law has been adopted, it is then the responsibility of the Commission to make sure rules are implemented.

What countries are in the EU? Wed, September 14, 2016 In the wake of Brexit, we look at the 28 member states that are in the European Union. Play slideshow Getty 1 of 29 Countries that are in the European Union

How do EU Commissioners get the job? The leader of each member state nominates a Commissioner to represent their country, with each College serving for five years. The Commission President is elected by the European Parliament – taking into account the results of the European elections. Once elected, the President confirms the list of Commissioners and hands out portfolios. WILL THE EU BUILD AN ARMY?

PH Sir Julian King is Britain's Commissioner